Libertas Americana Restrike

I recently purchased a restrike of this medal and I'm wondering if someone can point me to literature that will help with dating when it was produced. I have seen several that look similar on Ebay. PCGS and NGC are not helpfull with the restrikes.

The medal is made of sterling silver. It weighs 50 grams and its diameter is 46.6 mm. I'm assuming that it was probably struck in 1976/77 or 1980/81 to commemorate the victories of Saratoga or Yorktown, but it did not come with a certificate or any other form of attribution. It looks similar to the medal at 10 o'clock in the inserted image.




It did come in a Paris Mint box, but I don't know if its original to the medal.

Does anybody have suggestions ?

Thanks.