Blancpain

Hi, I’m a bit of a newbie with Blancpain and would like some help on the older perpetual chronograph models. I know the current model is the 2685, but at 40mm this is too big for my rather slender wrist. So I was wondering what are the differences between... 

ref.5580 is 34mm across and 11mm thick: ref.2585 is 38mm across and 13mm thick Obvisouly the watch is larger, has a new design and has received screw down corwn and pushers. I don't see why the movement would have changed. I did not find anything about re...  

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Best. Nicolas...  

Thanks for the pics and info guys. I had my 5580 delivered yesterday and sits on my wrist as I type. I absolutely love it already! I will post some wrist shots at the weekend, once I get some decent light. Merrick