3750 is basically the same watch as the outgoing one.
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after actually studying the pictures, you can see the differences..
1. seconds track now has less divisions to account for the 21,600vph movement, cleaner dial
2. sub dial depressions a bit different ie. look more like pie pan
3. middle of hands in sub dial aren't painted white
4. Speedmaster word looks bigger
and PROFESSIONAL looks wider too
5. bracelet looks finer, more like jubilee
6. clasp is changed.. undecided on this.