Diagnostic Controls & Presets Famous Proof Set Varieties • $10–$250+ Value
Diagnostic Forensic Readings
Forensic Attribution Diagnostic
Real-time metallurgical and die variety cross-examination verified against certified populations.
Technical Breakdown: Physics, Metallurgy & Die Diagnostics
Mintmark Punch Replacement Chronology
In 1979, the San Francisco Mint had been using a worn 'S' punch dating back to 1968. The punch had deteriorated to the point where the loops were completely filled with metal (Type 1 Filled S):
This resulted in two major modern variety transitions: 1979 Type 1 vs Type 2, and 1981 Type 1 vs Type 2. The 1981-S Type 2 SBA Dollar is the key variety across both years.
Typographical Identification Metrics
Under 15× magnification, the punch differences are unmistakable:
Registry set collectors compete heavily for 'All Type 2' certified proof sets containing all six denominations with verified Type 2 mintmarks.
Documented Benchmark Auction Records
Heritage Auctions Signature Sale. Flawless Deep Cameo preservation and razor-clear Type 2 mintmark punch.
GreatCollections Certified Auction. Pristine blazing copper mirrors with clear open 'S' mintmark.
Common original 1979 proof set containing standard Type 1 filled mintmarks on all coins.
Frequently Asked Questions
What does Type 1 and Type 2 mean on 1979-S and 1981-S proof coins?
It refers to the style of the 'S' mintmark on coins struck at the San Francisco Mint. Type 1 coins used an old, worn punch that created a blobby, filled 'S', while Type 2 coins used a newly introduced punch that created a crisp, clear 'S' with open loops.
Which coins have the Type 1 vs Type 2 varieties?
All six denominations in the 1979 and 1981 Proof Sets have Type 1 and Type 2 varieties: Lincoln Cent, Jefferson Nickel, Roosevelt Dime, Washington Quarter, Kennedy Half Dollar, and Susan B. Anthony Dollar.
Which coin is the most valuable Type 2 variety?
The 1981-S Susan B. Anthony Dollar Type 2 is the rarest and most valuable of the group, worth between $100 and $450 in top proof grades.
How can I identify a Type 2 Clear 'S'?
Under a 10x magnifying glass or jeweler's loupe, look at the two loops of the letter 'S'. On a Type 1, the centers are solid or filled with metal. On a Type 2, both the top and bottom loops have distinct clear openings, and the serifs have sharp flat ends.
Can a single proof set have both Type 1 and Type 2 coins?
Yes! Proof sets were assembled from different production bins, so it is common to find mixed sets containing two or three Type 2 coins alongside Type 1 coins.
What is an 'All-Type 2' Proof Set worth?
A complete 1981 Proof Set where all six coins are certified Type 2 is worth roughly $200 to $300, compared to around $10 for a standard all-Type 1 set.
Do major grading services distinguish Type 1 and Type 2?
Yes, both PCGS and NGC clearly designate 'Type 1' or 'Type 2' on the certification labels for all 1979-S and 1981-S proof coins.