Yes, month dot date for Z-M proof-facility from say 1902 till 1923 before Suhl came online with a date code.

I will concur it was for an affluent client but if you can't match the monogram/crown in the golden oval, it matters little. Also the action is an eccentric one being a bit cumbersome with regard to contemporaries at reproof.

Kind Regards,

Raimey
rse