I took pictures of this phone in Mexico City while visiting the house of Diego Rivera and Frieda Kahlo. While I was looking for further reference images, I found that its likely a L.M. DE100 wall phone 1921-model. Riveras phone seems to be missing the mouthpiece (which I added) and I couldn't pinpoint the exact font of the digits . Putting the model on sketchfab (in an acceptable texture-version) was an adventure in itself.