Inherited '43 Mauser

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Hi everyone, I inherited a 1943 Mauser P 08 from my father in law, and I know absolutly nothing about it. I tool it to a local gun shop here in town and the gentleman behind the counter told me a little about it, but he did not seem to know very much about it, or I should say to me it seemed he was reluctant to tell me to much about it then proceded to offer me $500 for it. I told him I would have to think about it and left altough I have no intention of returning to that shop ever, I believe he was trying to take advantage of me since I know nothing about it. I tried to get as clear a pictures as I could, my camera gets blury when I get any closer then this. If you could let me know what numbers or marks I could post to help out please let me know. So bottom line if anyone here could give me some more info then the gun dealer did I would be very greatful.