Speedmaster Pro with Tritium

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Which production year did Omega move away from tritium on the Speedmaster Pro? Looking for a used Speedy with hesalite/tritium and want to narrow down the search. Thanks all!
 
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From memory it was the early 90's. You want something pre 1992 I think.
 
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They made the switch around 1996 to super luminova in 1996/1997 as you will see some crossover dial and movement changes to the current caliber we see now as the 1861