Translations:The History of Dunhill's Shell/4/en
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The numerical code system for indicating the date of manufacture started in 1922, but occasionally we find pipes that can be dated before 1922, specifically, those that were Stamped: "DUNHILL'S SHELL" - "MADE IN ENGLAND", followed by "PAT. MAR. 9.15" over "PAT. APP FOR" and "PAT. 1914" with "PAT. APP FOR". These patent references are for the U.S. and Canada respectively. These impressions possibly date from the patent application, not the granting. It is hard to say with certainty, but it is speculated that the Shell was first marketed in mid-1917 while the patent process was underway. The blasting tests were run and improved starting in 1914 with support from the London Sandblasting Company, which specialized in glass blasting.
