Stardust Constellation f2.4 - Question.

SO,,,I went to put on this lovely beauty after a year or so in the box and it needed a battery change. No problem. Went to do it and there is a missing screw in caseback! Lord knows when this occured, or how, but there it is. Does anyone know if you can get a replacement screw from Omega or if it was used on other cases? Its going to bug me until I find one! For the record, this is a really wonderful watch and one of the main keepers in the collection - my wife's favourite.
Lets see other members examples too - these are stunning in real life and very difficult to photograph successfully. And it gets comments from strangers too!

Al
Thank you very much. Very helpful.

What a beauty. Which model is nicer; black or blue dial? Should be hard to find these days? And how many links has a full length bracelet ? Kind regards. Achim