Bonsour Ted,
In checking the 2 different obverse pictures. In Christie's and Dennis Non-Nevada strike book. As well as Bill Cohenour's book. I see that there are 2 different Bad River Casino series. 1 with the GDC MM and 1 with the S MM. And looking at the 1 complete set of Bad River $10 strikes that I have. Along with 1 from the indian series, like you have above. All these I have are of the S mint mark. Like the strike you show above. But mine are of the animal series. I have none with the GDC MM.

It looks like to me that the series with the GDC MM. Has the .999 on the rim only. No - .999 on the silver center. However, the series with the S MM. Has the .999 on the inside on the silver, on the obverse(casino) side. AND the same S mm series has the .999 on the rim on the reverse(theme) side. This is backed up by my observations of the Bad River S MM Strikes that I have.
Maybe someone has some Bad River GDC strikes. And can check both sides, to make sure.
I hope this helps.
Dan