It`s surprising how different these two watches are. The 5726 a rather bulky sports-watch whereas the 5740 is the elegant nautilus… Both cool pieces anyway ...
differences of the two. In the photo, the 5726 seems to carry the same grayish blue as 5711/1A and 5740 the blue as the 5711 40th anniversary and Special Client.
The 5726/1A-014 has the same blue as the 5711/1A-010. The 5740/1G has the same blue as the 40th anniversary 5711/1P. The special client 5711/1P has a little different blue to my knowledge…