1964 Quarter Pattern - RB-1165, INCO

Coin Details

Description

The RB-1165 experimental quarter is part of INCO's systematic exploration of copper-nickel alloy compositions for the US Treasury's 1964 silver replacement program. Produced at Medallic Art Company using official Washington quarter dies, this test piece allowed evaluators to assess the RB-1165 alloy's performance under realistic striking conditions. The piece bears the standard Washington quarter design on both obverse and reverse, making it visually similar to contemporary circulation strikes but metallurgically distinct. Numismatic examination typically reveals differences in luster, toning characteristics, and edge appearance that distinguish experimental alloy strikes from standard production coins.

Rarity Notes

Extremely rare experimental piece. The RB-1165 alloy is known from very few surviving examples, consistent with the limited production runs of all INCO test strikes.

Cross References

Reed-Brenner RB-1165; NGC census