1964 Quarter Pattern - RB-2350, INCO

Coin Details

Description

Test quarter struck by INCO in the RB-2350 experimental alloy composition during the 1964 clad coinage research program. The Reed-Brenner catalog places this piece in the middle of the RB-23xx sub-series, which represents a distinct family of alloy experiments within the broader RB-2xxx group. The physical testing of these experimental quarters extended well beyond simple visual inspection. INCO subjected test pieces to standardized wear simulations using tumbling barrels filled with abrasive media that replicated years of pocket wear in hours, measuring metal loss and surface degradation at regular intervals. They tested electromagnetic properties using equipment designed to mimic the coin-acceptance mechanisms in vending machines, parking meters, and pay telephones — all critical infrastructure that depended on the specific electrical conductivity of silver coins. They also evaluated striking quality, examining whether each alloy formulation filled the fine details of John Flanagan's Washington portrait and heraldic eagle reverse with the same fidelity as silver. The RB-2350 composition represents one point in this multi-dimensional optimization problem, balancing the competing demands of appearance, durability, electromagnetic compatibility, and manufacturing cost.

Rarity Notes

Extremely rare experimental piece. Population estimated at fewer than 5 specimens. INCO test strikes were produced strictly for evaluation and not for distribution.

Cross References

RB-2350 (Reed-Brenner), NGC ID: 61883