The origin of this pipe isn't very much clear. Some experts mention Excelsior pipes made in USA and England, but it look rather like an Italian (or Italian American) - nice briar, rich rustication, tasty combination of the "raw" unstained finish (a little bit polished) and bright acrylic shank extension plus stem. Exactly this Excelsior shape is represented at world known pipephil site. The most probably the pipe was born at middle or large manufactory with own shape numbering standards. Great (and still unsmoked!) finding!
The pipe markings are "EXCELSIOR DE LUXE \ IMPORTED BRIAR", "904". The length is 16.3 cm (6.42"), bowl's height is 5.3 cm (2.09"). External diameter of the bowl is 4.1 cm (1.61"), internal diameter is 2.1 cm (0.83"). The depth is 4.3 cm (1.69") and this pipe weights 47 gr. Briar, acrylic stem, metallic air cooler.