I own a S/42 G ( 1935 ) K98k Mauser rifle caliber 8x57 Mauser. On the base of the front sight is what I believe to be a proof mark, "K 167". Would any of you have any info on what the K 167 represented, or if it represented a certain factory, or whatever? I would really apprecitate it. Merry Christmas to all on the HIGHROAD!