Seems the transition to be compliant went thru a couple iterations: Saxony - Thringen - Prussia.

Broadly:
215 - 350 - Saxony
350 - 500 - Thringen
550 - Prussia.

Apparently there were a 1/2 dozen or more of Schaefer's offerings marked Thringen. I wonder what he was up to in 1892?

Cheers,

Raimey
rse