Remove the crown by pulling it outward to release the crown and stud from the internal stem. The stem will be in the hand setting position, so you’l need to apply a tool to reach through the case tube to press the split stem inward to the run position. The movement, case back, and crystal then can be pressed out of the case by using a crystal press. Maybe have somebody do this for you, if you are unsure. Are you sure you can do what is needed to the movement, if you do get it out of the case? Then, you have to be able to get it back together!
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