Early MM300's (like sbdx001) had no Diashield treatment, it was pure steel so they scratched just like any other watch, I guess your micro-adjustment clasp is genuine just it was dedicated for sbdx001.
Mismatched tag and manual are human error of the previous owner probably.
Your watch looks completely genuine to me, and Transocean (sadly) never became popular enought to be on target of the fakers.
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