Out of interest, the cases for the original Bund/[155?] and 156 are subtlety but importantly quite different, mainly on pusher symmetry, crystal profile and overall depth - due to movement, hand stack height and being auto/manual:
http://1.bp.blogspot.com/-Q8-V2VQczi...156+crowns.jpg
http://1.bp.blogspot.com/-EEvjGxsU-K...d+156+Rear.jpg
[The eagle eyed will also spot a difference in the usual 156 and this one...and the usual Bund and this one... ;) ]