[TuRo]

I think they are most unlikely to narrow, and more than likely diverge more in the next decades.

There's a lot of zenith bicolours and unless bi-colour fashion really takes off like in 1983/4 again (American Psycho set in 1985 and Wall Street everyone has one on and aspired to one).

As it stands at moment 'millennial fashionistas' are now keen on bi-colour....The Wall Street Journal did a piece a few years back....but it's not looking like a massive across the board swing in demand to two-tone, like say the big watch craze was from 2002-2018 (R.I.P. 47mm Ap's/ Hublots, Franck Muellers, Panerais, and even YM2's perhaps) where everyone, and their dog, wore a huge watch !

Only precious metal Daytonas that have caught up/raced ahead and surpassed the steels, are the early RARE as hens teeth 37 and 37.5mm full gold manual Daytonas eg lemon dial, JPS, etc .