Found new owner
For many years Oldenkott was a flagman of German pipe making along with Vauen. The company is known both by its good pipes for a good price and by its quite tangled and changeable history as well. Originally it was a Dutch company founded by Hermann Oldenkott in 1760, then it was partially bought by a German businessman August Kersten, then the remaining German subsidiary bought Dutch factories, then the company was bought by another Dutch company and finally Kersten family bought it again, but had to close in 1992. Such a 232 year long TV soap series :-)
The pipe markings are "Oldenkott \ WESTMINSTER", "212". The length is 14.5 cm (5.71"), bowl's height is 4.6 cm (1.81"). External diameter of the bowl is 4.6 cm (1.81"), internal diameter is 1.9 cm (0.75"). The depth is 3.8 cm (1.5") and this pipe weights 54 gr. Briar, vulcanite stem, 9 mm filter. The chamber has been protected with a break-in coat.