Found new owner
But we are toking today about another Royal Duke, not from Dr. Grabow. That's really interesting: the same brand was produced in 1960-70s in the UK by Hardcastle and Comoy's. Of course it's not a highest grade pipe, but it can be proud by the great parents, it remains unsmoked and it's completed with an original pouch and a box (the box has been slightly fixed after many years of storing somewhere).
The pipe markings are "Royal Duke \ LONDON MADE", "361". The length is 13.3 cm, bowl's hight is 3.7 cm. External and internal diameters of the bowl are 3.1 cm and 2.0 cm. The depth is 3.0 cm and this pipe weights 27 gr. Briar, vulcanite stem, no filter.