Can anyone identify this movement

[anths-repluca]

Hi guys,
can anyone identify this movement and how to remove the stem?
thanks in advance
Anth

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[rockpool]

if anything the release is under the rotor - spin it 180degrees so we can see the part where the stem goes into the movement.

 

[anths-repluca]

Ok give me a minute

 

[SSTEEL]

21J

 

[anths-repluca]

I've found it, there's a small push button to release the stem, thanks. Guys

 

[anths-repluca]