Thanks for the vote of confidence but I wasn't born with the knowledge. I learned from Dietrich Apel. Too, I give the tip of a hat to the pedantic Axel E. Dating in Suhl officially began in September, 1922 and for 6 months a ledger number was associated with the date-code. Either Suhl used a date-code & ledger number for about 6 months or they were sending their tasks to the Z-M proof-facility. I have read and/or been told that there was a Suhl Proof Facility renovation about this time, but I think it was a year or 2 earlier?? Maybe a trip to Suhl will ferret out the info here?

Serbus,

Raimey
rse