One thing to keep in mind in your search is the 3510.50 (or the improved version 3539.50) are true Speedmaster Automatic "reduced" models. The 3511.50 and all the other versions with the date are not the same watch nor were technically considered "reduced" (somehow they are starting more and more to be labeled that way, but its not really correct), they were Speedmaster Date Automatics. Yes, the Speedy date models are smaller then a Speedy Pro, but even the case dimensions here are not the same as a true Speedy Automatic "reduced" model. Everything about both models is different of which often newcomers to Omega do not realize until in the hand or on the wrist. Cases are completely different, dimensions are different, weight is different, bezels different (true speedy reduced models have a flat overhang ridge bezel more like a speedy Pro and Speedmaster date models have a concave more modern profile). Then of course movements completely different.
In both Speedy Reduced and Speedy Date Autos, there were a number of dial color references, each using the same respective cases. For the reduced, there were two pandas, a reverse panda, a blue dial, Schumacher racing models, AC Milan ltd edition, some two tone and try tone versions etc etc.. These were all limited or region specific when new (mostly in Japan). The Speedy date also had many ref with different dials, again, many region specific or ltd in some way. So really comes down to what look and mechanics you are going for. No wrong choices, but would try and see at least one example of a reduced and one date auto in person get an idea of the fit and feel on the writs. If not in person that do some careful side by side comparison research oneness you are considering to see how they look and compare. Good luck on your hunt!!
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