Some of the early developed coins for the 30th Anniversary Series went through some design changes. Here is an example of an Engineering Pilot Luke Skywalker (Yavin Ceremony) with an early designed McQuarrie Stormtrooper coin. The bottom of the unproduced coin reads "Concept" at the bottom of the coin
and the final production coin reads "McQuarrie Concept". If you have any unproduced TAC coins, please post them!
Special day today - I was given the opportunity to add this guy to the Sithsonian - Mockup of the TAC 01 Darth Vader card with the unreleased Vader coin.