Watch advice on 30t2

Hi everyone,

I'm new to omega vintages, and feel in love with the simplicity of the timepieces.
I am currently fell my eyes upon this piece and was hoping to get some help on identifiying if its a good to pull the trigger.

I love this dial and have been looking for a sub second silver/grey one for a while.
First of all, are the parts correct to this 2271? Couldn't find lots of reference images on this model. I notice that the movement has a missing screw (correct me if I am wrong) Any help from the commnuity would be really appreciated.
Thanks in advance guys!

Comes down to price and size. I would not buy it, because the case metal is corroded a lot. You see that as well on the mvmt. Surfaces and God knows what lurkes inside the gears..... The moisture will have affected the dial , which is repainted. Script too thick for that period. It should be cheap..... Kind regards. Achim