W. Collath Söhne 16 ga double gun, SN 20500
http://www.gunsinternational.com/guns-fo...un_id=100880842

W.Collath Drilling, SN looks like 18679
" double rifle drilling (8x57 and 16ga with two leaf sight) with a second set of "normal' drilling barrels double 16ga/ 8x57 under with a single automatic leaf, all bores pristine, all bbls steel nitro proofed for 2 5/8" and 195 grain steel jacketed bullet bore 172.28 (.318" I believe)."
http://www.gunsinternational.com/guns-fo...un_id=100980499