Measure it is the best answer I can give without seeing the reverse. The 50 centimes and 1,2 franc of 1944 used this obverse and had C on them.
1 franc light type diameter 23mm depth 1.45mm, I don't think the heavy type was minted in 1944 but that had a depth of 1.85mm 2 franc diameter 27mm depth 1.7mm 50 centimes light type diameter 18mm depth 1.27mm, again I don't believe the heavy type was minted in 1944 but it's diameter was 18mm and depth 1.5mm.
This is what I can find out, there may of been more coins with the same obverse with the use of the C mintmark.
Edit: It's known as the Vichy French state 1 franc or 2 franc. C mintmark was for Castelsarrasin.
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