BARLING: Marylebone Guinea Grain (1817) (9mm) (with Case) Tobacco Pipe. The Marylebone Guinea Grain Rhodesian comes in its own case. (as seen in photos). Pipes of the Marylebone series are offered with no additional ornamentation except for the sterling silver lion’s head logo that is inlaid into the base of the acrylic stem. MEASUREMENTS / OTHER DETAILS. Length: 5.95 in. / 151.31 mm. Weight: 1.40 oz. / 39.69 g. Bowl Height: 1.86 in. / 47.24 mm. Chamber Depth: 1.49 in. / 37.85 mm. Chamber Diameter: 0.83 in. / 21.08 mm. Outside Diameter: 1.60 in. / 40.64 mm.