Hello Minigun,
Some Walther collectors name this Olympia pistol the M1925 or M1934. I also have one in my collection, and the value is about $2,000 with a matching magazine. The wood base magazine is suppose to have the same serial number as the pistol. Your pistol is in excellent condition.
I prefer to collect the M1936 Olympia which was available with different types of frame weights and 'butterfly' weights. You can preview some of these M1936 pistols on my web site
www.imperial-arms.com.
Well done,
Albert