Michael, It sounds like you have a late war police accepted type 4 Sauer. These were the last Sauers produced for Germany before the Americans arrived in Suhl. The 291 on the bottom of the slide and the breech block are assembly numbers, and should match the last three digets of the serial number, but at this late point in the war, who knows? The only marking on the slide should be "CAL 7.65". The "thumbnail" type magazine is correct, and the zinc trigger is also. The finish on these guns was very thin, so the Eagle/F was probably done before finishing. I'd like to see a photo of your holster and its markings. It doesn't sound like a 38-H holster, and since production of the Model 38 didn't begin until late 1938, I doubt it is original to the gun. In any case, you got a good deal. A late model Sauer like yours, in very good condition, sells for $400 to $425 these days.