Harry's notes (on file) show that he tinkered with his SS100/80 hybrid for many years, the last entry dating from 1985.
Prior to the First World War, he equipped his motorcycles with De Dion, Minerva, Precision and Green engines and his use of proprietary engines continued after the war, with Blackburne, Bradshaw and JAP engines.
In 1922, the marque completed the fastest lap of the Isle of Man circuit for a 250cc machine on a tuned OK at 51mph (82kph).
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When Harry died, many of the machines from his collection were sold at auction (in March 1998), the SS100/80 being purchased by Gary Ross on behalf of Brough Superior Club member Doug Young.