Originally Posted by
DQRider
[SIZE="3"]I'm trying to find a nice old brass quadrant shifter for the top tube, but I'm not even sure if the cable pull is the same.
That's the first time I've ever seen a seat-tube shifter. I wonder how hard that would be to get used to. 
The tires are Fairweather Touring "Cruise" Tire, 700x38c - Cream from Velo Orange. Nicest, smoothest tires I've ever ridden on.[/SIZE]
As always with Sturmey Archer parts;
British eBay. (
Sturmey Archer Quadrant).
You might be able to get them for prices as low as £25.00 but generally they seem to go for £45.00 + shipping.
As far as compatibility, pretty much every regular SA 3-speed seems compatible with any shifter with the exception of the K-model and fixed gear versions.
Here is someone who mounted a Quadrant shifter on his Pashley Guv'Nor as well as someone who went the seat post approach.
Those are some nice looking tyres, and of course that's a Japanese brand.
Fairly cheap
directly from Fairweather in Japan, they have some nice stuff and a fair bit of collaboration with Panaracer and Nitto.
VO:
Fairweather (x Panaracer) Touring "Cruise" Tire, 700x38c
Guess I have some thinking to do.
EDIT:
Seat post mount with shim above seat post clamp.
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Image by Forrester)