Based on a re-interpretation of Seiko's vintage reference 6105-8000 these new Prospex models are all built upon the same 41mm steel cushion case featuring Seiko's Super-Hard coating with
link an inset crown at four and a closed steel caseback. Thankfully alongside the
link easy-wearing sizing we find a reported thickness of 12.3mm and a lug-to-lug of 46.9. Compare that to the SPB143 40.5 x 13.7 x 46.5 mm and you have the thinnest Prospex re-interpretation to
link date.