1990P-1DER-004T Trail Die Reverse

Description

Among the most significant trail die varieties for the 1990 Philadelphia date, 1990P-1DER-004T carries documentation of a mid-production reverse die change — the reverse die was replaced while the obverse die remained in service. This die swap is evidenced by the reverse being classified at early die state (EDS) while the obverse shows Stage C late die state (LDS) characteristics, confirming the obverse die had already produced a substantial number of coins before being paired with a fresh reverse die. The trail die features a 330-degree offset with light trail lines visible from the left tops of the E PLURIBUS UNUM letters and columns 2 through 8 of the Memorial facade. The obverse die at LDS displays heavy diagonal die scratches through LIBERTY — substantial surface damage that would have been immediately apparent on any coin struck from this die. Mid-production die changes are routine in high-volume cent production, where reverse dies typically wear faster than obverse dies due to their position as the anvil die absorbing repeated impact. The documentation of this change within the trail die catalog provides valuable die usage data for understanding Philadelphia Mint production sequences during 1990. Struck on copper-plated zinc planchets composed of 97.5% zinc and 2.5% copper, weighing 2.5 grams and measuring 19mm.

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