I've decided to part with this one. I sold my other about 8 years ago.
This is a rare strike with the GDC mintmark.
The on-line catalog states a mintage of '9+' for both this and the chariot design counterpart.
The original data I had from the mint way back when actually said 10 total were made (5 of each design, not 10 each).
Regardless it is a very rare item missing from most collections.
The last sale I am aware of for one of these was $3,000.
Any serious buyers for this item please email me at firstname.lastname@example.org with your offer.