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Sorry about the slow reply to your question.
Yes, it's a Sturmey 3 speed.
I normally use an AM on this bike, but because I needed to drag a good twenty pounds of luggage up to Stokenchurch I changed to an AW for this trip. With a 65" middle gear this gives about a 48" bottom gear instead of the 56" with the AM.
When I was young I would never have considered using a Sturmey, but now I find them useful. They're low maintenance, silent and, so far, completely reliable.
It's just a pity that Henry Sturmey had such bizarre ideas about gearing; the AW (by far the most common) gives 25% down from direct drive, and 33% up - it would be a lot more use if this was the other way round!
@clubman.
You take as long as you like.
SA 3 speed?
Enjoy the ride, that is the main objective.
Hope I'm still riding 'later in life' like you obviously are.
Cheers