Found new owner
So it was an old good French tobacconist. And GBD has produced some pipes with a special nomenclature for a customer as it was popular at that time. The pipe has a very nice grain and is completed with a huge air cooler like other Dr.Plump pipes in the middle of XX century. We would recommend to put this air cooler part in the pipe separately - it serves also as a chamber bottom.
This pipe is marked "Dr.Plumb \ - SPECIALE - \ H.LEGRAND \ ROUEN", "1102L". The overall length is 14.2 cm, bowl's hight is 4.0 cm. External and internal diameters of the bowl are 2.6 cm and 1.8 cm. The depth is 3.0 cm and this pipe weights 26gr. Briar, vulcanite stem, air cooler. The chamber has been protected with a break-in paste.