Omega Seamaster 300 Case Tube question (ref 2551.80)

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Evening Omega Forums,

I had just received my watch back (Ref 2551.80) from Omega's service and noticed that the crown tube does not have external threads on them.

The crown still screws in though so I'm assuming the threads are on the inside of the tube. However, when digging out the old crown tube from the bag of parts, I noticed that it was threaded. Is it standard practice to replace a threaded tube with what I presume looks like a press fitted one?

Would love some education! Thank you

 
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The tube you show in the second photo is not the case tube for the crown. It is the tube for the HEV.

The case tube for the crown always had internal threads…
 
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The tube you show in the second photo is not the case tube for the crown. It is the tube for the HEV.

The case tube for the crown always had internal threads…
Thank you Archer for the knowledge! I guess I havent noticed that before