Here is some great info. Luger Forum member, Bill Munis, sent me awhile ago about the Mauser humps :
" Hi Pete,
The "Mauser Bumb" -- I call it the mauser hump -- is usually found on the
early K-dates, but is actually scattered throughout the whole K-date
production. Later later K-dates seldom have the "hump" though and all
G-dates and 1936's do not. In mid 1937 the "hump" became a standard
production proceedure and it is found on all Mausers after this. The 1937
S/42 is a neat year with lots of variations -- one of them is the strawed
guns with a hump -- as all strawed 1937's did not have the hump until the
very last ones -- a transition gun -- and all the all blued 1937 S/42's have
the hump. Hope this answeres your question. If not, write me back and I'll
try to help you out. -- Bill Munis "
Regards,
Pete... <img border="0" alt="[typing]" title="" src="graemlins/yltype.gif" />