It is a double tournois from France, regional issue for Dauphine (the obverse has two fleurs-de-lys above a dolphin). I believe it is from the reign of Francis I, issued sometime 1521-47.
The double tournois from Francis I are not that uncommon, but the regional issues from Dauphine, with a dolphin, are scarce. It is difficult to set a value, but maybe around $30 for your coin.
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