Odd stem but apparently manufactured that way. There is a bit on the net about it but finding out why it is made like that is harder to establish. I did find this patent that seems to give an answer, whether its the right one I can't be sure but it certainly sounds like a good explanation.
US2655784.pdf
Cheers,
Vic
I'm not convinced Rogart, I think it is meant to be like that. The twist is anti-clockwise, you couldn't cause that damage in the watch because the clutch would free wheel.
Hi,
A bit late with this reply...
I made a couple of little tools for broken stems using stem extenders and a couple of old watch crowns but there has to be a bit of the thread left in order to be effective...
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If you really can't get the stem out and disassembly the watches definitely not in the beginners category a compromise would be to remove the dial. The setting parts are underneath and you can usually get the stem out sometimes if you're lucky without having to remove all the setting parts.