one of the rare double guns if compared with the amount of Drillings made between 1900 and 1914
steel barrel sleeved in 1967 and now for 16/70 - nitro profed,SN give by the gunmaker who sell it 14xxx
http://www.vdb-waffen.de/de/gebrauchtwaf...llath&o=neu

DR Collath&Söhne SN 6585 in 1,15x60R Mauser and 28 ga. full rifled
http://www.egun.de/market/item.php?id=5293208

Drilling in 8x72R and 16/65 SN 18317
stock seems not to be original
http://www.egun.de/market/item.php?id=5291673

another Collath&Söhne double gun in 12 ga(no.1)SN 20350
http://www.waffen-reinhardt.de/doppelflinten/collath-wb-667.html

double rifle drilling in 8x57irs- 8x57irs - 16/70
rechambered and new proofed SN 1928 new Swarowski scope on SEM
http://www.altejagdwaffen.de/Details.155.0.html?&no_cache=1&tx_fwwcat_pi1%5BshowUid%5D=14

18988(?) the firm was still G. Teschner & Co Inh. W.Collath

Drilling in 9,3x72R - 16/65 SN 14926
http://www.waffen-hiendlmayer.de/details.php?cID=5&sID=5&iID=46

Drilling in "360 N. E./20/70/20/70)" rifle caliber is probably 9,3x57R 360 or 9,3x72R
SN 287
EDUARD KETTNER' and "CÖLN A/RH. PATENT 63385" on the barrels
sold by Dorotheum last year http://www.dorotheum.com/auktion-detail/...coln.html?img=1

Double gun in 16 ga ( No.4) SN 1126
without any proof so before 1891
'Excenter-Kammer-Verschluß" on the right action side, "G. TESCHNER u. CO: IN FRANKFURT A. O. PATENT" in the action

http://www.dorotheum.com/auktion-detail/...nkfurtoder.html