ρολοι πολυ γνωστο,απλα σε αυτο το λινκ εχει μια αναλυτικη περιγραφη του
seiko marine master 300m
There’s more than one model of Seiko called ‘Marinemaster’, so to distinguish this one I’ll call it the MM300 to distinguish it from the 600M spring drive version. Both are part of the ‘Prospex’ line of watches, Seiko’s upscale diver line that’s only sold and marketed in Japan. (There are other Marinemasters as well, this page does not cover them.)
The MM300 designed for saturation diving, up to 300 meters, and is equipped with a special L-shaped gasket and one-piece case to render it proof against helium gas. Unlike the Rolex Seadweller and Omega Seamaster, a helium escape valve is not needed due to the superior seal - a more elegant solution, in my opinion.
It’s a large, heavy watch - 14.6mm high by 44mm across, 209g on the included bracelet, 136g on the rubber strap.
The watch comes with a rubber strap as well
The case is made of stainless steel, I assume type 316L but I’m not sure. It’s monocoque, meaning that the back does not come off and the movement is accessed after removing the bezel and crystal. Seiya claims it’s antimagnetic as well; I’ve not seen anyone
else mention this. Drilled lugs, unsigned screw-down crown
The movement is an 8L35, an undecorated and unadjusted version of the high-end Grand Seiko 9S55. Rhodium-plated, 26 jewels, automatic, 28800vph (4Hz), handwind and hacking, 50 hour power reserve. The size of the balance wheel was increased to provide the torque required, as the hands are heavier than a dress watch. The 8L35 is also used in the Landmaster, which has the same hands.The movement by all accounts keeps excellent time, and in 9S55 trim is capable of exceeding COSC specs. Anecdotal reports on various fora indicate less than five seconds’ daily error is typical. The spec is -10 to +15 seconds per day.The 8L35 is completely in-house Seiko, and is descended from the 6159 300m diver, circa 1969. Everything from oil on up, including mainspring, is Seiko. Kinda cool. What they call a ‘manufacture’. John ‘ei8htohms’ Davis is a big fan of the 8L35, and had this to say about it:
My understanding is that the Seiko 8L35 is pretty much the same movement as the 9S55, but perhaps missing a few refinements and not as thoroughly adjusted. As such, it is one of the finest automatic movements Seiko makes. The machining is of the highest quality and the design and construction is informed by Seiko’s many years of experience. I believe the 8L35 even has a Lossier inner coil on the hairspring. A very nice touch you will not find in any modern Swiss watches to my knowledge.
As far as the movement is concerned, it is a wonderful piece of work that is exactly what it claims to be: a grand Seiko movement. The finishing is almost entirely machined, but machining of exquisite quality overall. The edges are generally not chamferred (anglaged), but are incredibly crisp and the sides are cut to a near mirror polish..........................
