If you go for rubber get the one omega made specifically for the watch.
They are well under £100 $100 €100 these days used.
I have one for my next generation PO for when I’m on holiday, fit is fantastic.
Regards
Jon
Second on getting a omega brand. I had the black with orange stitch back in the day. It was very high quality. They can be cheaply found these days. It goes perfect with the 18mm deployment.
How about the hirsch pure or accent?
Though I’m not convinced on the criss cross pattern of the accent...