I had a 1961 model, brand new. I used to go to and from 'work' with it.
At that time 'work' was the base where i was stationed in Norfolk. I lived in Cornwall, so it was 435 miles each way every friday and sunday

on A and B roads, no motorways then.
After a couple of years it got a complete engine rebuild as being young and foolish I thought I wanted more power

and I used a slight smoking of the left hand barrel as an excuse. After the rebuild it still smoked ( only slighly as before, no oil usage).
They are a lovely nimble flexible tourer, but do not expect much over 85mph, and at that speed they do tend to wriggle. (reduces if you remove the bathtub, especially if you have panniers). Over 90 and it stops wriigling, but you need more power for that. With the real petrol we had then, a good mod was to put a 20 tooth gearbox sprocket in it and 9:1 pistons but keep teh original cams. lots of low down power right up through. Cruising then would get you near 100mpg. (and add quite a bit of power). I would not recommend that course now as modern fuels are too crap.
Now heres a thing, mine came with the exact same carrier as yours, and I can vouch for them, they are very strong and will carry a wooden barrel of cider

from Somerset. I bought mine from Jim Alves of Street Somerset when I was posted to Yeovilton.
Anyone who knows me would say I paid big bucks to get that number plate, so if you decide not to buy, let me look. It literally has my number on it . <smiley> cos i exceeded my picture allowance, although I would lose the number soon as i registered it here in France