Cate gives that Sauer Nr. 165,646 was made in 1914. I can dig up his contact email but I think you would be better off to contact Suhl master engraver & historian Henrik Frühaf:

http://gravuren-fruehauf.de/

He either has some copies or has full access to the Sauer records that exist in the Old Suhl Jail.

Serbus,

Raimey
rse