Baker Street Irregulars --- 1930 or 1940?

[georged]

 

[dmcmtk]

1940. A 1930 would have the "INNER TUBE" mark. A 1940 with the US Patent here,
http://www.pipephil.eu/logos/en/dunhill/patent3.html
and a 1930,
http://www.pipephil.eu/logos/en/dunhill/patent2.html#349

 

[ssjones]

Detective Dave strikes again!