1964 Quarter Pattern - RB-1175, INCO

Coin Details

Description

An experimental clad quarter with the RB-1175 alloy composition from INCO's 1964 testing program. This piece is near the end of the 1100-series, which explored a specific family of copper-nickel clad alloy formulations. The International Nickel Company's work on coinage alloys during this period represented a convergence of industrial metallurgy and government policy, as the Treasury Department sought to replace silver in circulating coinage without disrupting the nation's vast network of coin-operated machines. Each RB-number composition was evaluated not just for its numismatic properties but for its electromagnetic signature, which needed to fall within the acceptance parameters of existing vending machine coin detectors.

Rarity Notes

Extremely rare. The RB-1175 composition survive in single-digit quantities, making it a significant rarity among modern US experimental coinage.

Cross References

Reed-Brenner RB-1175; NGC census