1866 Proof Nickel Pattern - J-528

Coin Details

Description

With only five Judd numbers remaining in the sequence, J-528 tests one of the final alloy formulations in the 1866 Shield Nickel program. The comprehensive nature of this testing series — running from J-473 through J-533, with numerous "a" variants along the way — established a methodological standard that the United States Mint would reference for decades when evaluating alloys for new or modified denominations. The copper-nickel blend ultimately selected in 1866 has proven so successful that it remains the standard nickel composition in 2026, an extraordinary 160-year track record that validates the thoroughness of the original selection process documented by these patterns.

Rarity Notes

R.7. Estimated 5-10 examples survive.

Cross References

Pollock-3596