Info needed on my 1940 42

[luger1940]

Hi everyone, please excuse my lack of knowledge of the P08. I had a toy one as a child and recently came across a nice looking one in my local gun shop ... I purchased it with out any research, as it was a good looking gun, probably too good by all accounts.

I won't get my hands on it until the ticket comes through, but I have a question, in front of the trigger guard where most seem to have a serial number this one has a fancy ''S'' and no number, can anyone direct me to some info regarding this model please. tia