PS: 5402 for this last one, 5602 for the 41 mm... Smaller, probably, but size apart, I have hard time seeing the other differences... Same power resefve ( 70 hours ) and probably the same vph... [nt]
from a site covering Baselworld (hope I not not infringing any forum rule):
By: dms : March 21st, 2018-10:53
the Black Bay Fifty-Eight is not only a bit smaller than a standard Black Bay, it's also quite a bit thinner, coming in at a svelte 11.9mm (vs 14.75mm on the 41mm wide models)
It looks fantastic, after reading 39mm, they got me. I've seen it while my wife and I were having lunch today, I've reminded her how close my birthday is ))