From what I have read, the renovation of the Suhl Proof Facility was in 1921, so the Suhl Proof Facility used a ledger number for about 6 months commencing in September, 1923. So why start applying date codes in September 1923 or was there a rules change then to comply with the New Proof Commission / Conference, which was delayed by the 1st Major Disagreement in Europe.


Hochachtungsvoll,

Raimey
rse