Model # 420-3-G
SOURCE: I have a Telechron Minitmaster
I think this is old one with a 3 hours count down ..and it is a classic..with knobs ...(if Im not wrong ) ..in this case you have a knob that moves the red hand ..which set the position where it supposed to buzzz..and the other for arming the spring ...and this is all ..when you arm the spring and set the red into position ..it will count down until the hour will get exactly over the red one ..and buzz..
Let me know more about it ..and I will look for the exact model if it is the case
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