Dilly141,
The proof dates were stamped by the proof house, not the manufacturer. The likely reason your Sauers are dated and the T&S is not is because the Suhl proof house started dating them around 1923. The T&S likely went through before then and the Sauers were likely later. This can be confusing because the Zella-Mehlis proof house started dating them much earlier than Suhl and also marked the ledger number.
Mike

Last edited by Der Ami; 03/01/20 10:22 AM.