Got this today, cords and handset are not original. (Handset 1960'ies)
It has lived a hard life, but it works.
1 Line for in/out, and an extra line for asking someone when line 1 is on hold. no transfer option.
Pictures, schematics, and scan from the 1938 catalogue.
dsk
From the catalogue: (1938)
I actually was checking out a similar Phone by Ericsson last week.
My bottons are a bit different. Inside look virtually the same.
What is that thing on the back?
Now, I have the answer, it is for hanging the phone on the wall:
dsk
Still missing the right handset, so until something better pops up, I just added one made of Bakelite, probably German. A pretty worn 1950's cloth covered handset cord and black glue made the cracks and holes better. I had the missing cradle part in stock.
Its Working. No cleaning and polishing, just wiped with a cloth.
dsk
Looks good!
Yesterday I got a newer one (1941?), pretty like this, in worse shape, but with an holding coil, no diagram and model no so I'm not sure what I got.
I have measured as and tried to determine the circuitry, and it is mod of the one above. The short on hold is replaced by a 500 ohms resistor (brownish button) One set of contacts on the hooks switch are used for external purpose.
dsk