Tony, I`m no expert on Simson`s, but my opinion is that Simson started new production in 1925. (1923 Simson is a misnomer)They dated them thru the rest of that year and into the begining of 1926, then stopped dating them. (perhaps they were violating some Versaille treaty restriction and thought they could hide production figures better with blank chambers?)I don`t see how a 27 or 28 date could be real but I have never seen one.As for a 26 date over 1000,I guess it`s possible but you would be safer with a number under 700.Simsons are undervalued Lugers, they are rarer than Kreighoffs, at least in my experience.