Help needed how to open a watch case

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Hello.
I have this watch but it seems impossible to open the case.
Any help appreciatited.
Thank you
277167055_1653292248355258_2212966279905040600_n.jpg 276263754_3201828636764910_3606272310582929156_n.jpg 276133080_363738438959501_6788565254414065438_n.jpg 276084651_641382047160127_3697999740161087821_n.jpg
 
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Remove the crown/stem by pulling it out.
Use an air pump to puff air into the case and pop off the crystal.
Remove the movement through the front of the case.
 
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Remove the crown/stem by pulling it out.
Use an air pump to puff air into the case and pop off the crystal.
Remove the movement through the front of the case.
Thanks @JimInOz
Will try it
 
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Have you tried to remove the crystal with a crystal lift?
 
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It seems the crown wont go out :/
It should be a form of split stem, which requires certain (often uncomfortable) amount of force to pull out.

Attached are pictures from my NELCO movement (same watch). I am not at home now to send you better pics of the stem.
Some people remove the steel ring, crystal and then cut into the plastic to not pull stem on these, but don't do that... 😀

nelco-automatic-stroj-swiss-made-mechanicke-automaty-hodinky-119120249.jpeg nelco-automatic-stroj-swiss-made-mechanicke-automaty-hodinky-119120273.jpeg