I remember having one quite some years ago, and that's an indestructible watch.
I gave it to a pal of mine who entered the navy about 5 years ago.
if you want to modify it, then you can check: MKII watches.
I remember it didn't have any AR, it used white lume and it wore like a big 40mm watch.
I changed the original jubilee bracelet for an oyster type one.
that's a piece of watch, reliable just like a seiko can be.
cheers.
Chino.