Need I write more? Yes. On this pocket watch the stem is held on by the case. On some pocket watches the stem is held on by the movement. For that type the stem must be released from the movement and pulled out from the case in order to unscrew the crown. See my video on taking apart an Elgin pocket watch for the removal of such a stem
This video performed by an amateur. Do not attempt at home. No watches were harmed in the making of this video. For entertainment only.

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