STEM OF OTHER MATERIALS & Plug in bowls
CAPT WARREN, according to stamping on pipe, made in Italy. CW stamped on side of stem. Double bowl like the British Buttner, this is wooden bowl screw fit into wooden shank.
Whether the lower example has an inner bowl from another similar make of pipe is not known, but this one shows a push fit inner bowl with extra holes
My examples are definitely one smoke hole and a screw fit with a gasket
Overall length is 5 7/8 inches, height 2 3/8 and chamber diameter is 3/4inch