1964 Quarter Pattern - RB-1130, INCO

Coin Details

Description

An INCO experimental quarter featuring the RB-1130 alloy composition from the comprehensive 1964 silver replacement testing program. This piece represents one of the final entries in the 1100-series sub-group, suggesting it may incorporate refinements learned from testing earlier compositions in the series. The International Nickel Company's methodical approach — testing each alloy variant on actual coinage dies and documenting the results — gave the Treasury Department the data-driven foundation it needed to recommend the copper-nickel clad composition to Congress. President Lyndon B. Johnson signed the resulting Coinage Act on July 23, 1965, fundamentally transforming American coinage based largely on evidence from test pieces like this one.

Rarity Notes

Extremely rare. INCO experimental quarters from the 1100-series are among the scarcest items in modern US numismatics, with most compositions known from fewer than five examples.

Cross References

Reed-Brenner RB-1130; NGC census