Its a 350, but 500s are more expensive and its easy to make a mistake in the remunerative direction if you are trying to sell a bike. I remember Mike Byott as an enthusiastic member. If you look closely at the rocker box, he has the rocker covers I had made around 1990, fixed with my system of 4BA allen bolts, as described in Cheval about that time.
This looks like a good buy for someone.
36 4G, 37 VH, 54 KH(A), 75 Healey 1000/4, 52/53 ex ISDT KHA (project).
Former Machine Registrar & Archivist, General Secretary and Single Spares Organiser (over a 25 year period).
Now Archivist once more - but not Machine Registrar.