The clock in some models were the quartz movement origanally, you can here the second hand click round, these clocks were prone to failure and replacements, altho look similar, had a sweeping silent second hand.
The clock removed from the housing.
Bend back the tabs carefully and remove the face cover once teh hands have been removed carefully with a pair of small pointed nose pliers..
The spring washers can then be removed that hold the mech in position, the reset stalk and gear will stay in the backplate.
Waiting for spares and the new faces to arrive the clock and gauge referb was put on hold untill the new parts arrive.