You can bet this is someones masterful restoration (I do them too) . If it has fire blued pins, then it done correctly from that aspect. Safety needs to be painted an off white/tan color. Muzzle should be matt silver (white steel), inside of the receiver should be in the white up to about the "n" suffix on the serial number, grip screws are fire blued too (might look gray by now). A gun this old will have some of the strawing fading. It should be rust blued (a blue/gray color) not salt blued which is a blacker color (that came after and during late 1937). Look for grinding marks on the bottom of the magazine and a flattening of the bottom arc where the serial goes, look for clean numbers (real ones should be dirty/tarnished looking) on the mag bottom. Magazine should have an aluminum bottom with a nickle plated magazine tube/body.Serial on front of frame should be between 5000f to 4500p. Good luck and in Luger collecting if something looks to good, somebody probably made it that way....recently! ~Thor~
Ted's Luger Strawing Service