In 1927, the company became OK-Supreme and Frank Longman achieved its only TT win the following year.
In 1928, Humphries acquired HRD, kept its factory and tools, and sold the rest, including the name, to Phil Vincent who developed the HRD Vincent.
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.
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The production run started in 1935 as far as we can tell; engine types were Villiers and Blackburne on the early tractors, progressing to the JAP5 in 1938, through various American engines supplied under Lend/Lease during the war.
After WW2 the manufacturer went over again to using British engines with the JAP6 and Douglas SV54 making an appearance alongside the JAP5.
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It appears that Gary did nothing with the KTR engine, which is estimated to have only some 12,000 miles on its bores.