Green Ericofon famous mid century modern telephone from Ericsson

Green Ericofon or sometimes called cobra famous mid century modern telephone from Ericsson.  A few slight wear spots, see last pictures.

Height 21 CM

If want to try to rewire or make it work one modern phone lines 
A lot of information is on:
http://en.wikipedia.org/wiki/Ericofon

Signed Ericsson on the bottom.

I was not able to test it.