I was sniffing for collath guns and found this beautyful double rifle Hermann Historica sold in 2011
have not seen it then

"Lot Nr. 377
A Collath luxury double rifle,
Frankfurt/ O., first half of 20th century, cal. ..360 (?), no. 282785. Bright bores made of Witten Excelsiorstahl with only few light usage marks, refinished, German proof mark crown / "NGU", barrel root with gold inlays and leaf engravings, fixed sight and frog mount, barrel length 63 cm. Eccentric bolt action with horn lever, strong locks, double trigger (reblued?), rear set trigger on the right, rotation wing safety. Receiver with rich animal and oak leaf engravings, signature "W. COLLATH SÖHNE FRANKFURT A. O.". Elegant half stock of walnut root wood, hardly noticeably ground on buttstock, horn cap and horn trigger (repaired crack), good checkering, distance front trigger - centre butt plate 36.5 cm, two sling swivels. Total length 106 cm.
An extremely rare Collath double rifle deluxe model. "
http://www.hermann-historica.de/auktion/...;db=kat63_s.txt

this Cal.9 88 looks like a 9x57 rimless , especially when you look at the cartridge extractor
something must be wrong with the serial number 282785 is to high. must be more a 28278!?