I would look for an all original version (strap isn't that big a deal, IMHO). Buy what you like. I started with a 1958 Seamaster but thought I needed to have a Speedmaster and Flightmaster in my collection. After I purchased them, I realized they weren't my thing so I sold the Speedy and will be selling the Flightmaster. I am now focusing on 50's and 60's Seamasters and Constellations, with a couple of odds and ends thrown in for good measure. I can go broke playing in this pool a little more slowly than in the Speedmaster's.
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