Possible purchase - proof mark ID?

[Irishdiver]

I bought my first Luger last week and very new to the world of Luger collecting. I now have the chance to purchase a Swiss Luger. I believe it is a W+F M1906 made in 1921. I have researched as much as possible. I would like opinions on the proof mark located above the p56 stamp. Also what does everyone think of this pistol overall and the originality. These are the best pics I have at the moment. I appreciate the knowledge.