Hello,
There were at least 5 different variations of Mauser Schnellfeuer (excluding prototypes and Yugoslavian trials) - so far I have not seen any with S/N below 1000
- Early Nickl - lowest known to me 1145, highest 2912
- Late Nickl - lowest known to me 3144, highest 3178
- Early Westinger - Volume 4 of Kersten/Moll/Schmidt has a picture of 2476, which I believe to be a mix of Nickl upper and Westinger ower
- Intermediate Westinger
- Late Westinger
If needed, I can try to find in my docs on the S/N of Westinger models this WE