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The 3135 won’t fit in a 1500 case. The 1570 movement is flatter than the 3135.
It’s possible to put an Eta movement in a 1500 case, but you need to do some modifications like a movement ring, date wheel overlay, and you need other hands and reposition the dial feet.
I’m not really a fan of doing this because the watch is essentially no longer a Rolex but just looks like it.
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