France ecu c. 1715 Flip Over Strike?

I have a French ecu c. 1715 that is sea salvaged (Le Chemaux), but the legends of the obverse are strong on the reverse, and vice versa.  Is this an unlisted type, or a flip over strike?

It is 42mm.

http://www.elfreeman2.com/t22/5208o.jpg 

http://www.elfreeman2.com/t22/5208r.jpg  

Any help would be appreciated.  

Regards, 

Eugene

French coins of this era were frequently struck over earlier issues of the same type (called réformé or réformation in French).

Royal coins of France Louis XV (1715-1774) G.308 1/2 Ecu Vertugadin 1716 X réf. (Amiens) TTB+/SUP VF+/EF | MA-Shops

My guess is that this is what you have.

Thank you