There is something interesting about this I think? The Key looks similar to me to the early Casimir Lefaucheux styles.
He will not ship internationally to me though.
If you need help to buy it ?
Guillaume
For me,not a Casimir Lefaucheux.
I will you show keys of early Casimir Lefaucheux.
I totally agree with fusilLF
Yes it does not look like Casimir but it definitely looks early
Looks like a modified Gaubert lock or something like that …
it’s not an original shotgun , it is modified, made with unlike shotgun parts.
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Well now we know where all of the Casimir Lefaucheux shotguns have gone!! 
not all 
The first and the fourth have a big key.They don’t hold well in hand, “not pleasant”.But that’s not the main thing. The main thing : everyone had to see that you had a Lefaucheux!
or I can cut it
