1976-S Proof Bicentennial Quarter (Type 4) - Value: $1,200,000+ 

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1. Proof Coinage 

As a proof coin, the 1976-S Bicentennial Quarter (Type 4) was struck using specially prepared dies and planchets to achieve a high-quality finish with mirror-like fields and frosted devices. Proof coins are highly sought after by collectors due to their superior quality and limited production. 

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2. Limited Mintage 

The "Type 4" variety represents a distinct design modification on the reverse of the coin, featuring a unique artistic interpretation or alteration compared to previous types. This variety is exceptionally rare and sought after by collectors for its novelty and uniqueness. 

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3. Type 2 Variety 

The "S" mint mark indicates that the coin was struck at the San Francisco Mint, renowned for producing proof coins known for their exceptional quality and sharp details. Coins minted at this facility often command premium prices due to their superior craftsmanship. 

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4. San Francisco Mint 

The limited mintage of the 1976-S Proof Bicentennial Quarter (Type 4) contributes significantly to its rarity and desirability among collectors. Proof coins typically have lower mintages compared to circulation coins, making them highly sought after by numismatists. 

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5. Numismatic Significance 

As part of the bicentennial celebration of the United States, the 1976-S Proof Bicentennial Quarter holds historical significance. Collectors are often drawn to coins commemorating significant events or milestones in American history, adding to its appeal. 

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6. Condition 

The coin's condition, graded as Proof-70 or in exceptional condition, plays a crucial role in determining its value. Proof coins with flawless surfaces and sharp details command premium prices among collectors due to their aesthetic appeal. 

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7. Collector Demand 

The rarity of the Type 4 variety, combined with its historical significance and aesthetic appeal, results in high demand from collectors. Coins with unique varieties or features often attract considerable attention and bidding interest in the numismatic market. 

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8. Investment Potential 

The $1,200,000+ valuation underscores the exceptional investment potential of the 1976-S Proof Bicentennial Quarter (Type 4). As one of the rarest and most sought-after coins in numismatics, it represents not only a piece of American history but also a highly valuable asset within the collector market. 

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1976-S Proof Bicentennial Quarter (Type 3) - Value: $150,000+