All (with few exceptions) Swiss Lugers are 7.65mm and the front barrel band is smaller than a 9mm. So a sight tool made for a Swiss Luger will not work for 9mm DWM, Mauser, etc.
I have a concern about the sight tool shown. It has the Swiss cross on it, but the "pusher" is right down next to the barrel band opening. The sight base on a 7.65mm Luger is taller to make up for the difference in barrel diameter at the muzzle, so the pusher needs to be farther away from the opening (this is basically what Jerry is stating). I think very likely the tool is for a 9mm gun and the Swiss marking is bogus. I wouldn't pay a lot for this tool and/or I would want an unconditional return agreement in case it wouldn't work on either caliber.
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If it's made after 1918...it's a reproduction
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