This is the best find in terms of condition, found just 20 metres from my house in a freshly sown field.
I was actually walking back to the house when I picked up a strong signal - I wasn't too excited because of the amount of aluminium in the soil so the sound wasn't uncommon.
On the rear of the coin it says:
"Chambres de Commerce de France" around the edge banding and 'Bon Pour 1 (one) Franc".
On the face side it says:
"Commerce Industrie 1925"