in order that the customer should know which part faced upwards.At about this same time a one year guarantee against defects was offered on the bowl of each pipe, and to insure against far older Dunhill pipes being replaced under this guarantee a simple dating code, showing the year of manufacture, was devised and stamped onto each pipe bowl. Over the ensuing years great interest has arisen over the "mystique" of the Dunhill pipe in general and the dating code in particular.In recent years a number of articles have addressed how to use those date code stampings to date Dunhill briars dating after 1925 but virtually none have addressed the earlier years (R. Field 'A Dunhill Pipe Dating Guide' Pipe Smoker Vol 2 No.1 Winter '84; the Levin Pipes International dating guide in its Dunhill catalogues compilation; 'A Dunhill Pipe Primer' The Smoker's Pipeline, Vol 10, No.4 March '93; BRUYERE - PRIOR TO OCTOBER 21, 1918 1910 - October 20, 1918 - "DUKE STREET". Through June of 1918 they were stamped on a straight line: "A DUNHILL DUKE ST. W." From June 1918 through October 1918 a small subscript " " (sometimes called a "stop") was added after the "A".And even if this list was made available it would be of little use to any but the most expert because it can only be used in conjunction with the most precise knowledge of the Dunhill pipe as it has changed in appearance over the years. In 1950 a special series of "ODA" pipes was begun and continued through 1975.But enough of the complications in dating Dunhill pipes. These were not carved to order.1926-34 As above but with annual change of suffix number 6(1926) 7(1927) 8(1928) 9(1929) 0(1930) 11(1931) 12(1932) 13(1933) 14(1934)NOTE: For the years 1925-34 other patent numbers were sometimes used in place of 116989/17.While Dunhill introduced its initial "inner tube" fitting (a metal removable tube that fits in the shank to ease cleaning and removal of tobacco fragments) around 1911 it did not secure its initial patent for the same until 1913, thus duke street pipes with patent number stampings may be dated to the 1913 - 1918 period. For a two-month period, through the end of 1918 this "LONDON" stamping was equal in length to the "DUNHILL" stamping immediately above it..
Some further refinement of the pre- October 1918 period is also possible.
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Pipe collectors, especially in America, pride themselves on having acquired Dunhill pipes in prime condition which were made in the(the year of Alfred Dunhill's retirement).
Consequently, much confusion has arisen over the dating code because it has not been standardized over the years, and seemingly minor differences in the code can mean a difference of years, even decades, in the manufacture of the pipe.
The only finish to ever bear this duke street stamping was the Bruyere and after June 1918 the only other time Dunhill has employed the stamping was in 1985 in connection with its two Bruyere pipe sterling banded 75 Anniversary Set.