help with vintage movement...

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Hi all,

I am considering purchasing this very very nice 1961 Omega Seamaster Chronograph with a calibre 321, but I am looking at the movement, and seeing these things that don't align with that I usually see in calibre 321.
I was wondering if anyone can share their experience in whether these are actual variations or if this movement was piece together with parts not meant for it. (and other things you can spot?)

Combined with the fact that the crystal is not signed, I am thinking many parts were replaced during past servicing.

1. the chronograph driving wheel nub is way too small.
2. the hammer spring(?) tip shape is flatter and it usually rounded.
3. what is this stainless steel ring on top of the movement support?
4. anything else funky about this?

I hope I am overreacting, I do work in quality control so glaring inconsistencies annoy me -_-

These photos are from the seller:
 
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Be prepared to spend a chunk on it, if you buy it. The column wheel appears to have stalled in mid function as indicated by three yellow arrows. I would suggest that the chronograph is functioning poorly, if at all.

 
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could it just be in mid-function? lol

You're kidding, right? If the column wheel and all the other components that interface with it are working correctly, all components will index completely, and not pause in mid function.