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!
Aaaand unreleased Episode One coin on Darth Maul card
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.
Here's the Galactic Marine 02 as well
And a luke ceremony with the darth vader unreleased coin
Here's a stormtrooper on obi Wan card with unreleased lava miner coin
Legends C-3PO w. Battle Droid Head *unproduced episode 2 coin“
#03 - Mustafar Lava Miner with unproduced art coin!
I'd have to check old notes, but If I recall correctly, the coins were done as two ups. Dave mentioned that he had to do some additional work on most of them.