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According to Hampel (the author of two great books about automatic watches) the 41xx bears the same basic movement as the 11xx. He states the main difference being in the way the rotor is attached (and of course the additional day function - btw. only the 1160/61 & 70 have a quickset, where all the 41xx have one)
If you look at the pictures in the book you can see that the 11xx series uses 3 additional parts to clamp on the rotor (and then fix it to the movement with 3 srews) where the 41xx has those plates integrated in the rotor by having them on a ring).
Here's a pic of my 1121:


Cheers,

Axel
 

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Great, if you look closely, you can see the difference. The 3 plates that allows to mount the rotor on the movement (and act actually as the rotor bearing are single parts on the 11xx.
On the 41xx they are partof a ring (you can see it just behind the teeth of the rotor gear.

Cheers,

Axel

P.S. I replied your PM Stephen
 
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