The pipe markings are is “MASTA \ PATENT \ COOL CHAMBER \ A” on the stummel and “M.P.P.Co”, “MASTA PATENT” plus silver hallamarks for Birmingham, 1912. The length is 10.3 cm (4.06″), bowl’s height is 4.3 cm (1.69″). External diameter of the bowl is 2.9 cm (1.14″), internal diameter is 1.8 cm (0.71″). The depth is 3.4 cm (1.34″) and this pipe weights 30 gr. Briar, vulcanite stem, no filter. It can be difficult to push a pipe cleaner thru the stem, you may need to twist it some time or clean the stem from both sides. At the same time air flows freely.