Missing screw on caliber 321

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Because I shoot macro photos of my watches I noticed that my caliber 321 Seamaster is missing one screw.
Does anyone know the exact part number? I tried to Google it but couldn't find the correct answer.
@Archer perhaps?

 
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Yes, and what screw is that exactly?
 
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Can you provide a photo from another 321 movement showing what you expect to see there. If you get some better lighting on your movement, it may look the same.
Edited:
 
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Yes, and what screw is that exactly?
Why do you think it's a screw?
 
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I checked from another photo and clearly is missing and I can see there's a screw hole.

 
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OK... this is interesting now. I've checked many photos of Omega 145.006 cal 321 movements. And I think all of them are missing that screw. Every listing on C24.
 
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So, now that I have that screw… can I just screw it in? 😀 Or is there more to know?