Got this on a flea market. Can not find any reliable information so far, but the wiring diagram looks pretty equal to a Standard Electric 1921. More photos will follow after cleaning and some simple refurb.
Dating close to 1925 Kristiania Changed name to Oslo 1/1-1925. Handset marked Krisitiania, Telephone marked Oslo, cords seems to be authentic.
This wiring diagram is equal to what is mentioned in fig. 16.2 in The book: Old-Time Telephones! by Ralph O. Meyer 2nd edition.
dsk
It was in worse shape than expected. I have shined up the case a little, it should need to be sanded down and painted.
The fork has been straightened, the handset is missing the cone, and I had to cheat with with new parts to get receiver and transmitter working.I did so with the capacitor too. Inside the old box it is a modern one now.
dsk