Correct band for vintage f300 chronometer?

Hearkening back to the 1970s and 1980s when I worked for an Omega dealer, I recall these watches having been sold on leather straps. It was the owner’s discretion as to whether he wore it on a strap, or chose a bracelet he liked from inventory to replace the strap. Omega didn’t make bracelets, so whether you were deciding then, or now, you pretty well have to select from what is available. With all the years that have gone by, be assured that bracelets that were available then, will no longer be available. In short, I suggest you simply will have to choose from styles currently available, that suit the watch, and you. I have three F300s (two Omegas, and an Eterna) all on leather straps.