Preferred the old wind up when I was issued with in 1968. The one that had a strap made from what looked like old fertilizer sacking. Because it didn't have a battery which ran down at critical moments.
Eventually had one of the electric ones. Kept good time, but no stop-watch or multi time-zones made it pretty useless for world travelling. Bought a Breitling for that and only wore the service one when the Breitling went in for battery and seal changes. However, the last time I needed it the battery was flat - stores hadn't got any, nor had they any spare watches except the windey-up one which I gladly accepted. It was even older than the 1968 one I used to have!
Can't give you any more details; when you leave the RAF they don't give you a gold watch, they take yours away from you!
PS - If anyone tries to do a 'while you wait' Breitling battery and seal change, they will not be 'approved' Breitling maintenance agents and may well invalidate any warranty!