Rare 1827 Half Dollar Errors (List & Pictures)
Whole-coin views are essential for 1827 half dollar errors, especially when one reported piece combines several striking effects. Estimates across the eight categories span $100–$35,000.
The documented $28,200 overdate sale from January 2013 belongs to an exceptional MS67. Check design placement first, move into the date and portrait, then examine reverse marks and the edge before selecting a price comparison.
| Visible clue | Where to inspect | Category | Estimated value |
|---|---|---|---|
| Unstruck strip beside displaced design | Both faces | Off-center strike | $1,800–$4,500 worn |
| A curve from an old 6 | Lower right of final 7 | 1827/6 overdate | $300–$1,800 worn; $20,000–$35,000 exceptional unworn |
| Original defect interrupts design | Front of listed VF25 | Planchet flaw | $150–$600 |
| Border teeth inside the design | Below stars six and seven | Reported double strike | $8,000–$20,000 for confirmed O-148-family examples |
| Sunken star traces | Near shield and left wing | Reported partial brockage | $10,000–$25,000 for confirmed compound example |
| A raised line above lettering | UNITED STATES | Die crack | $100–$750 |
| Faint transferred shapes | Locations specific to each variety | Die clash | $100–$1,200 circulated |
| Curved cut with metal retained | Edge | Incomplete planchet cut | $200–$900 |
These Philadelphia halves have no mintmark and carry words around the edge. The normal unworn specifications are 13.48 grams and approximately 32.5 mm across.
1. 1827 Half Dollar Bare Metal Below the Front Design: Off-Center Strike Error
On the documented NGC VG8, the design sits about ten percent too high. A blank strip remains below the front and above the back when each is viewed in normal orientation.
The blank entered the press out of position, leaving those areas outside the dies. A separate PCGS AU50 was described as five percent off center; its smaller shift is not another measurement of the VG8.
How to Identify
Match the paired bare strips on both faces while preserving orientation. The missing design sits beside metal that remains present, unlike a clip that removes part of the disc.
Photograph the complete outline and date and inspect the unstruck surfaces for alteration. A wide rim on one face alone cannot establish the documented ten-percent displacement.
What It’s Worth
Estimated range: $1,800–$4,500 for worn coins with similarly obvious displacement. The NGC VG8 sold for $2,640 at Heritage on September 29, 2025.
That result shows demand despite heavy wear. The five-percent AU50 needs a separate comparison that considers both its smaller shift and lighter wear.
2. 1827 Half Dollar An Older Curve Beside the 7: 1827/6 Overdate Error
At the final 7’s lower-right base, part of an old 6 curves upward. The remnant survived when the die’s date was changed, and coins copied both the final numeral and surviving older stroke.
The front die was used with three reverse dies. Square Base 2 and Curl Base 2 describe another numeral and do not independently establish this overdate.
How to Identify
Match the upward-curving remnant with a confirmed 1827/6 before sorting out the reverse pairing. A scratch or unusual-looking 7 is insufficient without the correct older-digit shape.
Change the light to establish raised detail and keep all four numerals visible. Wear can reduce the small curve, but does not move its original position.
What It’s Worth
Estimated ranges: $300–$1,800 for moderately worn through nearly unworn coins, and $20,000–$35,000 for exceptional unworn examples. Those are distinctly different preservation levels.
The NGC MS67 Eliasberg/Kaufman coin brought $28,200 at Heritage in January 2013. An 1818/7 NGC AU53 at $1,320 in April 2025 supplies different-year context for the lower bracket.
3. 1827 Half Dollar A Defect Within the Front’s Metal: Planchet Flaw Error
The listed PCGS VF25 O-124a has an obverse planchet flaw. A planchet is the metal disc before striking, and “obverse” means the front.
The listing does not give the defect’s precise position or describe a peeling sheet. It therefore supports the broad flaw category without establishing a more specific cause.
How to Identify
Compare the complete front with the listed VF25 photographs. Examine how the original design meets the flaw’s boundary.
A later gouge may show cut surfaces or sharply displaced edges. An isolated hollow without its coin identity and surrounding design cannot establish the cataloged feature.
What It’s Worth
Estimated range: $150–$600 for a modest original defect on a worn example. No realized price is assigned to the listed VF25 here.
An 1832 ANACS XF45 with a minor rim-metal flaw brought $263.25 including fees at Pristine Auction in July 2025. Its different date and flaw location limit it to related condition context.
4. 1827 Half Dollar Extra Border Teeth Beneath Stars: Reported Double Strike Error
The reported O-148-family coin has interior border teeth beneath stars six and seven and part of an earlier portrait near three o’clock. Together they are interpreted as two strikes separated by a small movement.
The same coin also has reported reverse brockage traces. Its rare variety label is relevant to value, but cannot prove either striking effect by itself.
How to Identify
Compare the extra teeth’s spacing with the normal border and relate their position to the displaced portrait. Both should support a single movement between blows.
Short impact dents or cut lines do not reconstruct an earlier design. Keep the whole front, reverse, date, and edge together when assessing the combined account.
What It’s Worth
Estimated range: $8,000–$20,000 for a confirmed worn O-148-family double strike. The rare variety contributes substantially to this estimate.
A PCGS Fine 15 O-148 sold at Heritage for $12,650 in January 2011, but its description expressly says it has no doubling. That transaction is variety context only, not a double-strike sale.
5. 1827 Half Dollar Recessed Stars Near the Shield: Reported Partial Brockage Error
On the same compound-error report, one star lies about three millimeters left of the shield’s bottom and another tip appears beneath the eagle’s left wing. The collector interprets these as partial brockage.
Brockage forms when a struck coin impresses a sunken backward design into another blank. Only small remnants, rather than a full portrait, are reported here.
How to Identify
Light each star trace from opposite directions to determine whether it is recessed. Compare its orientation with the front stars to test the reversed transfer.
A star-shaped silhouette alone cannot distinguish brockage from clash traces or later coin-to-coin pressure. The depth, position, and wider condition of both surfaces must agree.
What It’s Worth
Estimated range: $10,000–$25,000 for the worn O-148-family compound example if the brockage is confirmed. This includes the rare variety and repeated-strike evidence on one object.
Do not add this range to the double-strike estimate. The $12,650 Fine 15 comparison establishes no brockage result, so the additional allowance remains conditional on convincing authentication.
6. 1827 Half Dollar A Ridge Above UNITED STATES: Reverse Die Crack Error
In the O-120 family, the reported raised route lies above the upper reverse inscription. It came from silver entering a split in the die, the steel stamping tool.
The result adds height to the coin’s surface. Its route remains the useful comparison even if wear weakens portions of the ridge.
How to Identify
Hold the eagle upright and trace the mark above UNITED STATES. A line near the front date belongs to a different inspection and cannot confirm this route.
Use changed lighting to separate a raised ridge from a scratch’s recessed center. Preserve the whole reverse in the photograph before enlarging the line.
What It’s Worth
Estimated range: $100–$750 for worn examples without exceptional variety rarity. Surface quality and remaining detail matter alongside the crack.
A cracked 1826 O-104 PCGS AU58 brought $1,020 including fees at Early Cents Auctions in August 2025. Its nearly unworn condition and different date prevent it from becoming an automatic four-figure price for an ordinary 1827 crack.
7. 1827 Half Dollar Faint Shapes Borrowed From the Other Face: Clashed Dies Error
The exceptional 1827/6 has a faint bar beneath Liberty’s ear. A separate Pogue O-129 carries traces around the eagle’s wings and head.
These distinct patterns came from the dies meeting without a blank and transferring design marks. Subsequent die polishing could weaken some traces while leaving others.
How to Identify
Select the appropriate coin before choosing a location: the ear for the overdate, or the reverse areas in the Pogue catalog. Do not combine their marks into a universal pattern.
Relate the faint shape to the opposite design and distinguish it from scratches or cracks under angled light. The matching transfer matters more than one unexplained bar.
What It’s Worth
Estimated range: $100–$1,200 for worn through attractive nearly unworn clash examples. Variety and visibility affect the comparison.
The $28,200 MS67 overdate sale also covers its ear-area clash. It does not assign that amount to the faint bar or establish ordinary worn-clash prices.
8. 1827 Half Dollar An Unfinished Arc at the Edge: Incomplete Planchet Cut Error
A collector describes an O-138 with a curved cutting trace while the metal remains attached. No clock position is supplied for the feature.
The blanking punch may have stopped before passing through the strip, leaving an earlier arc in a later blank. A completed clip, by comparison, would have removed a section.
How to Identify
Inspect the whole lettered edge and follow the curve to where it stops in attached metal. Low light and overlapping views help document its depth.
Look for saw lines, straight tool cuts, or crushed lettering from later damage. An unfinished curved route needs to fit original manufacture rather than simply resemble an edge notch.
What It’s Worth
Estimated range: $200–$900 for a worn example with convincing punching evidence. This is not a reported sale of the collector’s O-138.
The 1832 XF45 rim-metal flaw sold for $263.25 including fees in July 2025 supplies a related starting comparison. A clearly identifiable arc can attract specialist interest, while an ambiguous notch needs further examination.
Conclusion
Keep each feature connected to its location and specimen. The overdate’s curve, the O-120 ridge, and the reported O-148 stars have different causes and levels of evidence.
Estimated values span $100–$35,000 across very different conditions. The compound coin’s reported double strike and partial brockage share one valuation, while a sale explicitly lacking doubling remains only a rare-variety comparison.
