more pics for the nice double gun in No.1, SN 3100 http://bazar.hunting-shop.cz/inzerat/193854-collath/
without german proof but with czechoslovak post war proof made in the 1950s

very early Drilling in "16 ga" and 11x65 (11,15x65R) SN 7413 http://www.gunsinternational.com/guns-fo...un_id=100735836

till now the Collath Drilling witht he lowest serial number