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There is no indication of a date code for the war years. Parker was not a government approved pipe manufacturer, while Dunhill and Hardcastle were. During the war years Parker manufactured the "Wunup" pipe made of bakelite and clay.
Thanks to Jason Lynn, we now have photos of the following Parker pipe with a 19 date code, indicating there was perhaps some production of briar pipes during the war years. This pipe appears to have a replacement stem, or perhaps the unusual stem had to do with the war.
<gallery widths=300 heights=200 caption="Parker with a 5 date code (1955), courtesy Doug Valitchka">
''A little help here from anyone with date code information beyond 1957 would be most appreciated.''