STEM OF OTHER MATERIALS & Screw thro bowl
Thanks to Doug Bisbee for identifying this one
5.75 inches (145 m/m/) overall length, Bakelite ? body, translucent yellow plastic bit
The metal inner part has a metal tube, solid threaded end and a lateral hole, which attaches to an outer casing to increase length of smoke tube.
No markings at all on pipe to indicate maker.