1867 Assay Commission Medal - JK-AC-3, Aluminum, Longacre Pattern

Coin Details

Description

The 1867 Assay Commission medal JK-AC-3 in aluminum is an experimental striking that reflects the Philadelphia Mint's fascination with this then-novel metal during the mid-nineteenth century. Aluminum was still a rare and expensive material in the 1860s — more costly per ounce than silver — and was prized for its remarkable lightness and bright silvery appearance. The Mint struck various pattern coins and medals in aluminum during this period as the metal's properties were being explored for potential numismatic applications. This aluminum JK-AC-3 carries the same Longacre design as the bronze and silver versions but exhibits the distinctive characteristics of aluminum striking: a brilliant white luster, exceptionally light weight in hand, and a slightly different quality of detail reproduction due to aluminum's unique flow properties under the press. The metal's resistance to tarnishing meant these pieces would maintain their bright appearance far longer than their bronze or silver counterparts. The production of Assay Commission medals in aluminum during the 1860s was part of a broader experimental program that also produced aluminum pattern coins in various denominations. These pieces were never intended for general distribution but rather served as metallurgical curiosities and presentation pieces for officials and collectors with connections to the Mint. Their survival rate is correspondingly low, making aluminum Assay Commission medals among the most sought-after variants in the series.

Rarity Notes

JK-AC-3 (1867) in aluminum. Aluminum was a semi-precious metal in the 1860s, and strikings in this composition are rare. Far scarcer than the bronze or silver versions.

Cross References

PCGS #972458; JK-AC-3; 1867 Assay Commission