I have examples of all three post war guns. A comparison of the three reveals they are indeed essentially identical in every way. Some parts will interchange, some will not (likely due to the small amounts of hand fitting still necessary.) One of the guns actually has both Simson and Sauer names on it. A close look appears as if the Simson name was affixed first with a roll stamp, then partially removed with some machine tool, perhaps like a mill bit, then the other name added on top of all that. It's all rather blurred, but the quality of all the guns is good. I see basically little difference in these guns and pre war Sauers and Merkels I have. My only pre war Simsons are O/U guns, so there is no direct comparison in pre and post war Simsons in my group.
