The 1970 Kennedy Half Dollar Value Guide

The 1970-S DDO FS-101 is the primary doubled-die obverse variety for the 1970 proof Kennedy half dollar, catalogued in the Cherrypickers' Guide under its Fivaz-Stanton designation. It occurred during the hubbing process at the San Francisco Mint when the working die received a second hub impression at a slightly misaligned angle, transferring the design twice at fractionally different positions. The result is a permanent, raised doubling built into every coin struck from that die.

To identify FS-101, examine "IN GOD WE TRUST" and "LIBERTY" under 5x to 10x magnification. The secondary impressions appear as raised, rounded parallel lines running alongside the primary letters — a characteristic appearance distinctly different from the flat, shelf-like extensions of machine doubling (also known as die chatter), which carries no collector premium. Both the motto and LIBERTY lettering show the spread clearly on FS-101.

Collector demand for this variety is strong because it can be paired with the full proof grading spectrum — standard proof, Cameo (CAM), and Deep Cameo (DCAM) — meaning a single coin's premium stacks three separate attributes. A PR-65 DCAM DDO FS-101 represents a meaningful upgrade over a plain PR-65 DCAM, and high-grade DCAM examples have reached over $1,750 at auction when the doubling is pronounced and surfaces are pristine.

The 1970-S DDO FS-102 is the second documented doubled-die obverse variety for the 1970 proof Kennedy half dollar. Like FS-101, it resulted from a misaligned double hub impression at the San Francisco Mint during die preparation. However, FS-102 displays less dramatic spread than its counterpart — the secondary impressions are measurably narrower and require slightly higher magnification to confirm unambiguously.

Collectors and attribution specialists differentiate FS-102 from FS-101 primarily by the degree of spread visible on "IN GOD WE TRUST." On FS-102, the doubling is most evident on the letters of the motto, with LIBERTY showing less prominent secondary impressions compared to FS-101. A side-by-side comparison under 10x magnification makes the distinction clear, though both varieties share the same raised, rounded doubling profile that distinguishes true hub doubling from worthless machine doubling.

Values for FS-102 run roughly 40–50% below those of FS-101 at equivalent grades, reflecting the less dramatic visual impact. Nevertheless, DCAM-designated examples carry meaningful premiums over standard proofs of the same grade. PCGS separately attributes FS-102 across all three proof designations — standard, CAM, and DCAM — and CAC stickered examples attract additional collector interest at specialized numismatic auctions. Cherrypicking FS-102 from original sets at standard proof prices remains a rewarding pursuit for the patient specialist.

The 1970-D Prooflike is one of the most extraordinary varieties in the entire Kennedy half dollar series. On a small number of 1970-D business-strike coins, the flat field areas of the die were polished to such a high degree — possibly from freshly prepared working dies at the start of a die run — that the resulting struck coins display deeply mirrored, reflective fields almost indistinguishable from those found on proof coinage. Only 6 to 10 examples are currently believed to exist with confirmed PL or Deep Mirror Prooflike (DMPL) characteristics.

To identify a potential Prooflike, examine the flat field area of the obverse under a bright, focused light source. A PL coin will clearly reflect a distorted image of your finger or the light source in the background fields, whereas a typical business-strike 1970-D shows the even cartwheel luster of a standard mint-set coin. The contrast between reflective fields and slightly frosted devices (Kennedy's portrait, the date, and the inscriptions) is the defining characteristic.

The extreme rarity of this variety stems from the 1970-D's mint-set-only distribution: coins were packed immediately into cellophane and cardboard, never tumbled through bags like circulation coins. Yet even within this protected context, dies capable of producing PL surfaces apparently existed only briefly before wear reduced the mirror quality. Greysheet prices range from $1,750 to $2,000 for certified examples. Professional third-party grading by PCGS or NGC is essential for any suspected PL coin.

The most dramatic known 1970 half dollar error is also one of the most unusual wrong-planchet strikes in U.S. numismatic history: a small number of 1970-S proof Kennedy half dollars were struck on aluminum Shell Oil promotional game tokens rather than standard 40% silver-clad planchets. The Shell Oil Company produced aluminum state-specific tokens in 1969 and 1970 as part of a promotional game, and three of these tokens somehow entered the San Francisco Mint's planchet supply — through accidental mixing or deliberate introduction — and were struck by the Kennedy half dollar dies before anyone noticed.

The resulting coins show Kennedy's portrait, the inscriptions, and the reverse eagle design impressed into aluminum rather than the normal silver-copper composition. The aluminum substrate gives the coins an entirely different weight, color, and ring compared to a genuine silver proof. Identifying diagnostics include the coin's dramatically lighter weight (aluminum is roughly one-third the density of the silver-copper alloy), its distinctly different metallic color, and the absence of the reeded edge profile visible on standard half dollars.

Only three examples are currently known to exist, making this an extreme rarity by any measure in modern U.S. coinage. All three were reportedly discovered inside sealed proof sets, either by the lucky original purchasers or by later collectors who opened their sets. The combination of the intriguing backstory — Shell Oil promotional tokens accidentally turned into U.S. legal tender — and the extraordinary rarity drives collector premiums well into five figures. Any suspected example must receive authentication by both PCGS and NGC before any transaction.

The 1970-S Deep Cameo (DCAM) designation is awarded by PCGS and NGC to proof coins exhibiting the maximum level of contrast between their devices and fields. On a DCAM coin, Kennedy's portrait and the reverse eagle appear brilliantly white and frosted — almost powdery in texture — while the surrounding field areas display jet-black, mirror-flat reflectivity. This stark "black and white" visual contrast is highly prized by proof collectors and drives meaningful premiums above standard proof examples of the same numerical grade.

The degree of cameo contrast depends heavily on die freshness: the sandblasting or acid treatment applied to proof dies creates the frosted surface on devices, but this texture wears away progressively with each successive strike. Early coins from a freshly prepared die show dramatic DCAM contrast; later coins from the same die are standard proofs. Because the San Francisco Mint struck 2,632,810 proof sets in 1970, die wear varied considerably across the production run.

PCGS data indicates that approximately 40% of certified 1970-S proof coins have received the DCAM designation, reflecting the relatively generous DCAM standards applied by graders for this era. A PR-69 DCAM is the finest designation available and has sold for up to $430 at auction (Heritage, April 2021). Standard PR-69 examples without DCAM trade for roughly $50–$60. The price gap between DCAM and non-DCAM widens sharply above PR-67, making the DCAM designation most financially significant at the top of the grading scale.