Going down to a 1 watch 'collection'? Assuming they all fit well, I would go with the OP as I would consider it as probably the most versatile of the three. Tough enough to stand most things you throw at it (the original explorers watch) while the dial is more formal compared to the other two. You should have options to dress the OP up and down quite easily.
Based on what criteria? Which two will generate the most cash if sold? Which looks best on you? Which is the highest quality? Which has the greatest historical significance? Which is most likely to appreciate the most/at all? Which is the least expensive to maintain? Which works best as a GADA watch? Which best fits in with the rest of your collection?
We need more to go on if you want useful advice. Otherwise you are just going to find out which watch is any given person’s favorite—effectively a popularity contest.
Assuming you are going to a one watch collection, I would keep the Explorer as I think its the most versatile watch there is. A speedy would be a great second watch but you can swim with an Explorer and I would not want a manual winder as my only watch.
What are the reference numbers?
For all I know, the Explorer is a 1016, the Speedy a caliber 321 in a CB 105.012-66 case, and the OP 39...
Okay, sell the OP 39 for starters, then give us more info!
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