This field instrument was made by or made for Wyssen Seilbahnen in the early 50ies. That specific one is probably made in 1955 to 56 based on date stamped on the Leclanché made capacitor.
It's use may have been in maintenance or repair situations to call to the base or top station. Or for temporary installations at base and top station. The company still exists, if I find the time I will contact them and ask if details for that instrument are on record.
Universal battery compartment which accepts either a 4.5V lantern battery or 2x 1.5V D cells.
Ready for use
User guide and wiring diagram inside lid. The plate made by Aloxyd AG is signed with a date of Nov. 30, 1949, probably the year of development/release of that instrument type.
Standard Swiss Modell 1931 handset with P.T.T. On TX side adaptor to fit newer Type 1946 elements.
RX element opened. RX elements of this type exist sealed and to open. If the to open once can be opened to exchange diaphragm or if it is just because of mfg. process is unknown to me.
RX element type 1931, mfg. by Gfeller, TX element type 1946, mfg. by Zellweger.
Battery compartment, Ringer bells and indicator, Coil, Generator. Ringer and Coil are mfg. by autophon, Generator seems to be of british make.
Capacitor on top of generator. Lightning arrestor on right above battery cup.
Date on Leclanché capacitor suggests an instrument mfg. date of 1955 to 56.
Empty box, generator crank hole in bottom.
Handset and crank handle stowed..
Read for transport or storage.
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