Having seen and become convinced to buy a new Brightz chrono;
when they come out, I'd like to share some theories about this little known new calibre and ask the experts like Randall and John Davis what they think.
Firstly it's obvious the new movement is based on the 6R series, Kohei-san on TZ confirmed this, the 6R is in turn based on the 7S series with additional features and made only in Japan, the 7S as far as i know and can see seems to be a 'detuned' economised version of the old 7000 series including the venerable 7016 chronograph movement.
Taking this into account could it be that this new calibre designed and made by Seiko Instruments is actually an evolution of the 7016?
My initial thought when seeing pictures of the 8R28 was that it could be a 6R with a piggy-back module, such as the ETA 2894 or more elaborate GP or AP calibres with piggy back column wheel designs. However having seen detailed pictures of the 7016 it seems this new calibre could well be a design derived from the 7016 which has the chronograph mechanism hidden beneath the winding bridge?
Of course there are differences between the 8R28 and 7016, the new calibre has a traditional tri-compax sub-dial layout and AFAIK features not only a vertical clutch but also a tilting pinion such as the 6S series. It also runs at 28,800 bph as opposed to 21,600 in the 7016 and also 6R it's derived from, it also hand winds, and I'm assuming hacks.
All in all though this is a very interesting new calibre, even if it is derived from the 7016 as I suspect- what's most heartening though is that this puts Seiko in a very elite position, they now have two different automatic chronograph movements, both featuring column wheel actuation with vertical clutch engagement and tilting pinions- in fact I can't think of another company that has one, let alone two chronograph movements with such sophisticated chronograph designs- perhaps only Rolex produces such a technically advanced design in the 4130- i own one but I must say for $2000 there is no doubt these new chronographs have little competition, as most in their price range and above feature the much less advanced and cam-actuated eta 7750 or 2894 with DD piggy-back module.
Would love to hear what you all think about this.