marking on '36 S/42

[Gary_3]

Hi... On a 1936 S/42 I own,matching,under the serial # (789#)on the front of the frame under the barrel, there is a small script letter either "a" or "o", I cannot tell which, but with two squiggly lines coming out of it on either side of an oval. What is the significance of this mark? Is it common? Does it mark an interesting variation?

As I do not at present own any luger books that would aid in the identification of this mark, I thought I would ask you here. I recently saw a 1937 S/42, on one of the gun auction sites, with a script "ne" in the same place that was identfied as a Werkschutz gun, which raised the question in my mind about the marking on my gun.


Thanks,

Gary