French Double Date Rubbed Not Sure Which Ruler Help Need To Identify Period

It is a French feudal issue. A double denier tournois from the Principality of Orange, date unreadable but should be 1640-43. The portrait is of Frédéric-Henri de Nassau, prince of Orange.

Obverse inscription: FRED.HENR.D.G.PRIN.AV (Fredericus Henricus Dei Gratia Princeps Auraicus)
Reverse inscription: DOVBLE.TOVRNOIS.(year)

As for value, hard to tell. There are many varieties for the obverse inscription (could be PRI.AV, PRIN.AVR, etc) and I think yours is unusual. On the other hand, the coin is in rather bad shape, and for a more common inscription variety in this condition, at most a few dollars value. A specialized collector may be willing to pay a premium despite the condition.

Numista page for the coin: https://en.numista.com/catalogue/pieces56244.html

If I'm reading this correctly, it's variety f1, which is only listed for 1640.

But I think the portrait looks more like 5th type, in which case it's variety d1 or d2, not listed on that page for any year.

Yup, you are right, @january1may!