CJ:
I'm sure there are. Geno is correct and there was a Model XXIII as a hammer version of the pigeon gun with Krupp Fluid Steel and then in 1907(?) there was an a. & b. version of the Model XXIX(29) with the a. version being a Meisterarbeit and the b. being an a. with ejectors. Mr. Cate gives an A., C. & S. with the S. being the best. The Model A. had Krupp fluid steel and didn't have lower intercepting scears(???) like a Model VIII(8). It was the C. though that had the Krupp Spezial Weapons Grade Steel with Sauer's chopperlump variant, having some type of sensitive front trigger as well as lower intercepting scears. So the Spezial Gewehr Lauf Stahl was offered on the Sauer pigeon gun.

Indeed J. Stephens was correct and I guess yours to be an early Sauer Model XXIX a. if it doesn't have ejectors.

Kind Regards,

Raimey
rse