Remove movement form ST 111.0108 Geneve

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Hi All,

This feels like a silly question however I've picked up a ST 111.0108 with a cal 620 movement and wondering how to get it out to service it.
https://www.omegawatches.com/en-au/watch-omega-geneve-omega-st-111-0108
It references it as a press in case, but not sure if it just needs a push or there is some other locking mechanism other than the case clamps I'm missing?
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Thanks!
 
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105
Once again I feel like an idiot. its a 3 piece case so there is a top part of the case to pluck off with a case knife...
::facepalm1::