I've got an F Koeller & Co that was my great-grandfather's. I posted it at the shaving room, here, and spoke to Jamie who posts as celticcrusader here. I know it would be difficult to restore, the scales are bone and might not be saved and there is heavy pitting. I've just started to try out a straight, used it twice, and think I might try and get this restored in the future. I've had a bit of a google and can't find an F Koeller like this one so was wondering if anyone had any more information.
http://img838.imageshack.us/img838/6528/fkoeller1.jpg
http://desmond.imageshack.us/Himg807...pg&res=landing
http://img42.imageshack.us/img42/206...0830183001.jpg
On the back of the tang is a steam train, on th other sid it says F Koeller & Co Ohligs - Germany.
http://img221.imageshack.us/img221/6...0830183046.jpg