Here are a few pictures about my Jules Gervais/Emile Warnant SLE #26246.
The gun has no engraving.







The locks are from Jacquet and used to be gold plated.
The bores are large (18.6mm), but I believe that they came this way from the factory. Wall Thickness is 0.03", so no problem there.
The chokes are substantial. I'll probably open them up.

I hope this helps...

WC-