Found new owner
A mysterious pipe from William Demuth Company. The bowl has no markings, but the collar is stamped with three faux hallmarks plus the equilateral triangle containing the "WDC" trademark. Therefore we're unable to date this pipe exactly. But we would be probably correct to claim the pipe as 60-80 years old, taking into account its unusual horn shape and the stamping "SOLID RUBBER" on the stem (such was the term used for "vulcanite").
The pipe markings are "WDC". The length is 15.0 cm (5.9"), bowl's height is 5.1 cm (2"). External diameter of the bowl is 3.7 cm (1.46"), internal diameter is 2.0 cm (0.79"). The depth is 3.8 cm (1.5") and this pipe weights 46 gr. Briar, vulcanite stem (slightly patched, you may identify that under a bright light), no filter. The chamber has been protected with a bowl coat. There was a small neatcrack in the shank, but the have additionally fixed it with a strong glue, plus there is the original collar. The carving style is different on the left and right sides of the bowl - a later modification?