STEM OF OTHER MATERIALS & Threaded bowl
VUILLARD & STRAUSS this was named the Three in One. French made I am told by Michael Jefferies and patent No 318413.
Abstract of GB 318413
318.413 Maurice Strauss and Vuilard & Strauss Ltd October 17th 1929. Tobacco pipe;- A set of interchangeable bowls [e] are each provided with a plain or screw threaded spigot [g] for engagement with a corresponding socket [d] in a member comprising a stem [a] integral with a bottom [b] of the bowl. A flange [c]on the part [b] engages a rebated portion [f] Fig 1 of the bowl [e] or forms a beading [c] Fig 2 around the bowl.
Specification references 195.253 ; 232.464 ; 240.325 ; 243.154 ; 267.843