If you mean would the links from the 1998/840 Speedy 3570 bracelet work on a SMP 2254 type 1610/930 then yes, but I don't know what you mean by SMP 50th Anni (you mean Seamaster Pro right? That is the normal meaning of SMP). AFAIK there is no such watch. Yes the half link from the 2254 can be used on the pin type 1998/840 on the Speedmaster.
EDIT: Are you talking about the black dial SMP GMT? That has 50th markings I guess, though the Great White doesn't. Yes one version of the GMT uses the 1610/930.
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