Thank you (all) for the speedy advice! Very much appreciated
#JwRosenthal - I've had the watch for a couple of years but only removed the spring bars once before (when bought, to clean it). I lucked out when looking for a vintage Omega & found this one in a pre-owned Rolex dealer. It came with a 1067 strap and 557 end links.
I've just purchased a replacement crystal thanks to the advice of #JimInOz, which I've still to fit.
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