muzzleloading shotgun proof marks

[longgun60]

I have a double barrel muzzleloading shotgun with a proof mark of a crown over wheat and 3 plus signs in it. The number 34 is stamped beside it. I have sketched out the proof mark and attached it to this post. Please help me find the orgin of this gun!

 

[squirrelheart]

Take a look at these and see if you can find yours.

https://store.bluebookinc.com/Info/PDF/Firearm/Proofmarks.pdf

 

[arcticap]

I'll wager that it's a French proofmark.

It looks most like the 4th one shown here indicating "devices classified as firearms, simple or modal proof".

http://www.damascus-barrels.com/files/Damascus-Barrels_dot_com_French_Proofmarks.pdf

The PDF originates from this site:

http://www.damascus-barrels.com/More.html

Looking at another site's French Proof marks, I wonder if the crown indicates 1st proof and the bottom section 2nd proof (St Etienne), maybe because it has double barrels.
Click on the French proofmarks link which is #4:

http://www.gunaccessory.com/Proof_Marks/proofmarks.htm#4.

Here's a link to a French shotgun forum to inquire for more info.:

http://www.gournetusa.com/forum/