Impossible to get accurate Guesstimate
Simson used the same serial range FOR ALL .22's. Includes , sporters made in the 20's and current with DSM production as well as a few sporters in 5.6x35 centerfire. DSM and KKW production overlapped and sporters were still being made right up to 1945. Appears certain blocks were dedicated to various models and not all numbers used. There is overlap of Simson marked receivers and BSW subsequent to 1935.
The "high" and "low" numbers in the range are absolutely no indication of quantity produced.
Compared numbers of Simson DSM's observed and recorded vs. other makers observed and recorded such as Mauser (for which we have accurate records and a dedicated range) is of not much help either due to the the geographical locations of the factories, logisitics with marketing, likely more of theirs sold in areas captured by the Russians and British.
What I can tell you is for the American Collector they can be very difficult to find.
Not much help, hopefully did not add to the confusion.