The first OHV production Sunbeams were listed as the model 8 (350cc) and 9 (500cc) in 1924.
The model 8 with bore/stroke dimensions of 70x90 mm was an excellent sporty tourer, but stayed somewhat in the shadow of its more glamorous big brother, the 80x98 mm Model 9, which stayed in production till 1939.
From 1932 on a 600 cc version ( Model 9A) was marketed , with engine dimensions of 88x98 mm, giving 599 cc.
For model year 1929 the appearance of Sunbeam machines changed completely because the firm had finally decided to adopt a saddle tank.
Apart from that an entirely new frame was designed.
Further refinements were enclosed pushrods and valve gear on the OHV units.
The clutch was also modernised, it got six springs instead of the single central spring that was used in previous years.
Because of this 1929 update there were hardly any changes in specifications for 1930.
This well-sorted two-port touring machine comes complete with Lucas electrics and steering damper.