COLUMBIA

Department : METAL STEM & Threaded bowl
Marked on the front end cap as Columbia Silver Co , 689-91-93 McDonald Ave.Brooklyn NY Pat Apl'd for.
It is in the threaded bowl section since the bowl itself has a metal nut inserted to take the screw that goes right through the shank

Another design that makes it a nightmare to clean, unless done very frequently. The internal 'plunger' is a very close fit and it seems likely that left too long between cleaning the inevitable sticking of the parts must have ensued. The bowl retaining screw seems un-necessarily complicated and makes a sealed path for the smoke less likely







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