Correction, the "691" would be an assembly number. Odd paring of "L", "M", "1" and a script "H" or "K". Also the cartridge designation "9,3 X 72 Norm" arrived on the scene circa 1912 to bring together the D, E & Nimrod versions of the 9.3X72R. What type frame does it have, is it an underlever or toplever?

Kind Regards,

Raimey
rse