John, some refer to Seiko 5 series divers as Monster but the true Seiko Monster
is Ref.# SKX799Kx and SKX781Kx.
The diameter of Monster is 42.47mm across 9 o’clock and 3 o’clock using Mitutoyo
vernier caliper. It will be 46.74mm if you measure across 12 o'clock and 6 o'clock.
The thickness is 13.08mm.
Monster does not have manual winding capability so you just need to give few good
arm motions to wind the watch. I’ve never truly measured the power reserve capacity
but it's good 40+ hours.
Monster do not have hack function either - although there is a way to hack them by applying
a slight back pressure on the crown but no gurantee as to what will be the consequences
of this method in the long run.
The Monster bracelet is actually a very nice looking solid bracelet and my recommendation
is to get the bracelet then rubber strap or NATO as needed since buying the original bracelet
later can be little costly ($50 ~ $75).
Btw - Monster does go well with NATO strap.
