105012 Speedmaster vs 3861

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I've seen lots of videos of people comparing the 3861 and the 1861 Speedies, but I'm interested in how it compares to the og, 1st gen 105012 Speedmaster Professional (4th gen Speedy).

Apart from the movement, can someone breakdown all the case, face and dial differences between the two?

For example, lug to lug, lug shape, case shape, thickness and so on.

Cheers
 
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Case wise (L2L, shape) should be same as it wass the 4th gen they used. hash marks on the dial obviously different as they went to 2 marks in between seconds.