WTB Buzzer units for Field Phone

[Dean (Ajax)]

Does anyone have the Buzzer units that fit into the top right of the "field Phone" they have 2 black lockable knobs
Looking to buy a couple.

Dean

[rob love]

Which field phone? I think I have some for the old phones we used from the 60s into the late 90s. I think the model was TA312 or something similar.

[Dean (Ajax)]

Hello, The Telephone set is a Mk 5...they are war dated but were used by Cadets until the 70s.

Thank you

Dean

[Johnny Canuck]

Hello Dean
Canadian and British telephones are usually designated by a letter code and then a Mark number. Telephone D Mk 5 is probably what you have. There are different buzzers for different sets, I think it has something to do with the number of contacts??

Geoff