G'day Geoff
Your picture came through - looks good, but unfortunately the more I enlarge it, the more distorted it gets.
To start at the front and work backwards -
Aluminium brake backing plate, original racing equipment.
21 inch front wheel, genuine.
Where his hand is on the petrol tank would be over the rev counter, but I do not see a drive to this.
I hope Hector was at the time not using this bike in anger as the front down-tube is about to break in half. There should be a lug with a steel bar going to the top of the cylinder head as a steady.
The engine has some peculiarities but, to take a good guess, it is a 1937 250 ? racing Excelsior Manxman.
Petrol tank look right but I have never seen 'Excelsior' written that way.
Racing oil tank, gearbox, TT carburettor look authentic.
However, he has a rear light and number plate, and pillion footrest, which makes me think he used it as everyday transport.
Now, if Nigel can tell you how to email me without going on the general site, I will give you a guy's telephone number in Sydney who is compiling Excelsior material. He's not on the computer and would not put his telephone number on the general site.
He may be able to help with Hector.
(I know of quite a few Australia-wide.)
Regards, Geoff