It's more likely a non-Pro replacement or service dial in a later 70s Pro case. Looks like an Ed White dial which is valuable in its own right but could well be lume washed which is a shame and if it is and is fitted to a 861 movement then the feet will have been messed with. Caseback is from 1971 at the earliest. The bezel as you say is 1990s onwards.
A lot of issues to consider.
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