Here we have a Seiko 7549-7010, AKA the "Tuna Can" in component form. Edit: It has been bought to my attention that this is NOT a Baby Tuna! Hi Jim, Saw your On My Bench post for the 7549 ( 47mm diam) and noted you referred to this watch as the "baby tuna" Whilst it's a baby compared to the original grandfather tuna (50.5mm diam) I've always associated the "baby tuna" with the 5M23A series which had a plastic shroud and 43mm in diameter. The 7549 was the first professional 300m quartz diver ever produced and because it had the silver metal shroud was nicknamed "Tuna Can" Interested to see if any other WIS pick up on this. So the introduction has been updated accordingly. Not much different to the one I just completed except for the case design, which I'll get to later.