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Still required for a PPL afaik; if we're talking airline service and the like probably 50s/60s sometime?
@%~} : Seiko made RAF/RN issue quartz chronos, and still make similar civvy models. Citizen also have a range of pilot's watches - think they have the Red Arrows license?
My grail pilot watch would be an IWC Mk XI (or possibly a Mk XIV - at any rate one with proper MOD hands rather than B-Uhr-styled sword hands), but they're silly money these days. Still kick myself that I didn't get an ex-SAAF issue watch when I had the chance.
I went for a Timefactors Speedbird III instead, which is a properly brilliant replica - I got one of the early watches with the sterile dial.
Both are pilots watches...
One is a modern take on it giving scales and graphs and calculations.
The other is a historic pilots watch - the Nav B Uhr watch (or a variant) which comes from the WW2 pilots (technically the navigators) that needed simply but BIG CLEAR MARKINGS. read this for more