Telegrafverket's Verkstads wall telephone model made almost same between 1893 and 1925, 32 years.
Model called AC150 or Tvm.
Mine is made between 1913 and 1920, when factory was in Nynäshamn (now a days inside Stockholm).
Phone looked quite original when I did get it.
Biggest thin what someone had done to phone was the over painting of the battery cover decal.
This may be done because phone had been sold in Finland during the Russian rule and their did not like the about the Swedish logo.
That I sanded carefully to front and then covered with shellac as well as the whole phone wooden parts.