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Maybe one of these 'Nite' watches? My wife's grandad has one that he swears by. It's really substantial feeling and the luminosity tech is quite interesting.
https://www.nitewatches.com/store/gb/ (enable night view) -
There's one of those Steve Irwin Citizens on time factors I think. The Royal marine special Ed.
Pretty sure they are only 40mm, but very legible.
http://smg.photobucket.com/user/psychlist/media/CitizenandCWC.jpg.html
EDIT: This was the watch in my head:
so....
Christmas gift - 80 y/o Dad, would like military, big numbers because he cannot see so good - uncluttered - budget £400ish.....
on my list is TimeFactors, Steinhart
any other recom's?