Hamilton WW2 Ship Chronometer Detent Locking Jewel for Model 21

This is a NEW spring detent Locking Jewel for a Hamilton model 21 movement. The model 21 is the large spring detent escapement chronometer. 

Note that we service these chronometers and have more parts.  Email us with your needs. We also have the repair manual and can download you a copy.

Photo of model 21 movement for display purposes only.