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Old 16th Sep 2018, 12:37 am   #6
midshires
Triode
 
Join Date: May 2007
Location: Northampton, UK.
Posts: 32
Default Re: Mystery telephone

M probably stands for Magyar (Hungary) and Ericsson had a joint venture factory in Budapest.

The dial looks German but the telephone does not!

http://www.postamuzeum.hu/en is the website of the Budapest Telecomms Museum, and somewhere on this they have a full set of circuit diagrams of old telephones. But it's past my bedtime, so you'll have to do some searching yourself.

Good luck,
Andy E.
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