This family of pipes have been seen as Knowles Air Lite (believed to be Canadian version), Roybrooke, Comet, Original Gridiron. Seemingly sold in sets that comprised a normal briar bowl as well as the metal outer with a briar insert. The body of the pipe can be hexagonal, square ( Thoro Kleen only seen this shape) or circular in cross section. Regardless of variant all parts are interchangeable. The unmarked version tends to be regarded as the COMET, all the others being stamped with a name. See others on this site under their name
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