Hello,
I found a some unnamed currency with id=11887:

response from https://en.numista.com/catalogue/get_currencies.php?country=france&prefill=&ct=1
gave me the same:
<option value="1425">France – Pound Parisis (987-1667)</option>
<option value="6529">France – Denier</option>
<option value="305">France – Livre tournois (1204-1795)</option>
<option value="303">France – Franc (1795-1959)</option>
<option value="77">France – New franc (1960-2001)</option>
<option value="9006">France – Euro (2002-date)</option>
<option value="11887">France – </option>
Is it ok?