I found what is most probably a modified/leveled 'key ring' (chatelaine) made in France during the 1819-38 period ('old man' period).

Here are the marks :

Unfortunalty, silversmith mark is almost unreadable (even with a better pic than mine ;-)
At least, I would identify the region where it was made thanks to the garantee mark :
a bearded man in profile, with the figures "1" and "6".
Which departement is it for 1819-38 period ?
Thanks.