If you want to go Speedmaster, I say go full modern, I just gave my eldest son a Tintin for graduation- in 25 years when he looks back, the watch will be matched to his grad date and will carry additional meaning.
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If you want to branch out and consider other brands and diversify your budding collection, I'd suggest a Polar Rolex Explorer II, 16570. They can be had in great condition for $4500 with box and papers, and of all the Rolex pieces, its the least obnoxious.
If this is something that interests you, I highly recommend Tony Geha (aka "justrolexes" on the rolexforums), and also at sdwatches.com He can source anything Rolex.
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