1964 Quarter Pattern - RB-1025, INCO

Coin Details

Description

The RB-1025 experimental quarter is part of INCO's comprehensive clad alloy evaluation program conducted for the US Treasury in 1964. This specific alloy formulation was tested for its suitability as a replacement for the traditional 90% silver quarter composition. Medallic Art Company of New York, serving as INCO's striking contractor, used official Washington quarter dies to produce these test pieces under carefully controlled conditions. The testing evaluated not only the visual appearance of the finished coin but also critical technical factors: the alloy's behavior during annealing, its hardness after striking, resistance to toning and corrosion, and compatibility with existing vending machine detection systems — a crucial practical consideration that ultimately influenced the final alloy selection.

Rarity Notes

Extremely rare. INCO experimental pieces in the RB-1000 series are among the scarcest modern US numismatic items, with most compositions known in fewer than five examples.

Cross References

Reed-Brenner RB-1025; NGC census