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I got it on a May (1969) 6139 but must of been put on at a later date.
The bracelet is incorrect but the clasp is correct.It came on this but a 6139 expert told me it was incorrect.
View attachment 496556
View attachment 496557
I second this. Looks like a Kakume Speedtimer JDM clasp.John, I have seen this type of clasp on a 6138-0030 Kakume JDM but I am far from an expert.