Lovely sleuthing in the bowels of the BBS. Yes, Sauer Modell Nr. V and not III. I'm sure the effort on both were completed by the same mechanics. Sauer & the Boys Kettner were real chummy and I'm not sure if it was due to Sauer being mechanized & could fill most orders or if there was some family sourcing relationship.

Cheers,

Raimey
rse