Sorry, not sure what you mean by Mark X. I've had it, and the Longines, for over 50 years; bought in the days when ex-WD stock was being sold off. If it's any help here is the underside.
Nice Mk11. I paid £65 for mine! Your crown appears to be from a '56 (eg. Omega or Longines). Let me know if you ever decide to sell or want to trade.
@rodabod started
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Sorry, not sure what you mean by Mark X. I've had it, and the Longines, for over 50 years; bought in the days when ex-WD stock was being sold off. If it's any help here is the underside.