What year is it... looks in lovely condition.... does it have the hand operated gear on left of tank?... does it have the obligatory Sunbeam 'oil bath chaincase' ? I'm assuming it's the 500 lion?
sorry, brings back great childhood memories, my Father had 4, 2 350 side valves, and 2 500 ohv's... all 1936 to 38
used to pull a child/adult chair ... toured all over the British isles
I could tell you about the time the clutch burned out in the lake district... 8 hours on the side of the road, boiling corks on the primus stove, (corks obtained by a very helpful AA man who raided the local chemists in Coniston.... fitting corks , rubbing down and refitting everything... of course, the chair had to come off to access the clutch... can't imagine how , at the age of 12 I managed to help the old man get it off and back on again...
anyway... long story... best told over a pint one day
good luck with the old Beamer... lovely to see