Omega DeVille differences in manufacturing year?

This watch is a bit of a time capsule in Omega’s lineup, they must be still selling as they have had it in production remarkably long and I think its one of the very few Calibre 2500 movement watches still in the lineup. The dials are rather basic, nice but not as detailed or special looking as some other models like the Aqua Terra or the Hour Vision series. They stand out even in AD cases looking like old stock when they’re really new stock still.