Really need to see the any marks fore of the flats & the water-table but it looks to be something like an E. Schmidt & Habermann Modell A.D. 1 or possibly an August Schüler Modell No. 1. For sure not a Sauer product, but the Kerner-Anson Body Action could have been sourced from a number of other mechanics including Kerner himself. Is the word Nitro stamped on the sides of the tubes?
With the overstamps, I'm curious if there was a template utilized to apply the proofmarks @ each respective proof facility?
Cheers,
Raimey
rse
