First Generation Z clocks
The first generation Zcar clocks were made by “JECO” and basically all mechanical with a no-load motor to keep the main spring wound. This clock was not as reliable/accurate as expected because it is very sensitive to dust and contaminants.
The unique identifiers of this clock are the rear mounting bracket and the sloped clock face, which matches the 240Z dash. Power is supplied to the clock through the blue wire(+12 volts DC) and black wire (ground).
As an interesting note the clock movement, not the clock housing, was used from 1970 through the first half of 1974 , 260Z, when it was switched to the 280Z style. Also, the number font on the clock face plate was the same for 1970- through 1976.