Glyfada Grand Opening Ancient Greek Warship ERROR pin : silver back

Glyfada Grand Opening error pin -front is the same but back side of the pin is SILVER instead of GOLD. Pin was produced in 300 pieces total, retail couldn't tell how many of each (golden or silver) they received Painted style. 5 lines print. Logo - Musical Theme - Guitars Drums Logos etc Pattern. This pin was sold through retail and/or online. Base Material is Silver Appearance