Allin Cycles was one of my LBSs for many years and the authentic Allin era ended with Peter Cobb's retirement in 1981, I have a couple of old timer friends, one of whom worked there for over 20 years.
Regarding Stand Butler models, there were three: the top model being the Special distinguished by a fully wrapped over seatstay. Some frames were badged Allin after Cobby retired but they aren't true Allins - although some were built by the late and highly regarded Cliff Shrubb - I have a Geoffrey Butler built by Shrubby.
See this link for more info, I made a modest contribution to the article -
http://www.classiclightweights.co.uk/bu ... allin.htmlRk.
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V-CC member #584, co-founder of V-CC Lincolnshire section, member South Eastern Road Club. In the garage - 1987 Roberts(lugless)Audax, 1986 Raleigh SBDU Pro Super, 1984 Raleigh LU Corsa, 1984 Roberts Tourer, 1980 Allin Stan Butler Special, 1977 Geoffrey Butler(Cliff Shrubb built), 1976 Geoffrey Butler(Roberts built), 1975 Bill Philbrook(lugless)tourer, , 2 x v.early Roberts #107 & #127, 1966 Raleigh Superbe Roadster, 1964 Allin Stan Butler Special Belgique, 1951 Hobbs of Barbican S/C, 1950 Hobbs of Barbican S/C, 1947 Hetchins Super Special. MTBs - 1988 Specialized Stumpjumper, 1988 Muddy Fox Courier(Wife's).