-SG- Here's a good shot of Frith and his 1937 Junior TT mount - he finished second to Jimmy Guthrie. The detachable silencer insert in the megaphone was a nod to the authorities for legal riding on open roads! The DOHC engine and massive front brake are clearly to be seen.
... and here's the great man in action in the 1937 Junior TT at Quarter Bridge on - I assume - the same machine!