A. Lange & Söhne

I'm new to ALS and need some expert advice. I've posted this in another forum but got no reply, I'm looking at buying a Saxonia Automatik 315.032 and found two versions of L921.4 in them (see pics). Do you guys know which one is the latest one and what's ...  

I am not sure if you have your models correct because the current Saxonia Automatic does not have a mini rotor and comes with the normal half sized central rotor. In addition, the movement of that watch is the L086.1 and the reference is 380.033 in rose g... 

Thanks for your reply, sorry I should've clarified that the one I'm looking at is the discontinued model 315.032 like this one which uses the L921.4 caliber (not sure if I'm allowed to post link here): watchbase.com Thanks again.

with “als” written on it, where one of the movement is split into 2 with 4 blued screws and another is just 1 whole plate with 3 blued screws?

I just marked the differences with red circles on the pictures ...  

... but nothing conclusive. I'm 98% sure that the movement on the left (single piece) is more recent. I say that after comparing various Langematik Perpetual movements. The Langematik Perpetual has been around for much longer than the Annual Calendar and ... 

For your detailed explanation. Yes I believe the one without sub bridge is the newer version but since I'm new to ALS I just want to get some advice from other ALS fans especially when I'm buying a pre-owned one. Thanks again for your help I really apprec...