According to the numbers, https://is.gd/bsAcy4 link Mark 1.5 serials span from 2.08M to 3.04M, estimating https://is.gd/vLipdU link production from 1969 to 1972, with possible batches https://v.gd/VfYlJ7 link grouped at 2.197M and 2.648M. Again, this could change and original owner provenance watches have been bolded.

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