It's genuine - it's the "69 Model" at the following link:
http://www.speedmaster101.com/145-022-69/
You should check but it should have the large seamonster case back. Bezel is beat up, but the original dot-over-90 variant.
Dial is not unattractive and the matching lume on the hands indicates they are most likely original, as David says.
Price chart on that same website indicates it's worth approximately $2500 in running condition (no box, no papers, no bracelet, assumed unserviced).
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