Are there Belgian proofs on the other tubeset? Either the previous custodian had easier access to the Liege proof-facility rather than the German ones or the mechanic he tasked for a new set of tubes(possibly two)a sourced ARMAF for the tubeset. With the German proofmarks on the water-table, it was an all German product at one time. Evidently the Liege artisan couldn't spell Krieghoff?

Cheers,

Raimey
rse