Found new owner
Pipe manufacturers used a number of technologies and tricks to satisfy smoker's requirements and give as much smoking comfort as possible.
One of such pipes was made most probably in 1950-s in Chechoslovakia. Except the specific stem construction the pipe looks like traditional Czech "Bruyere Garantie" from that time. This pipe is marked "EASY GRIP". The overall length is 13.2 cm, bowl's hight is 3.8 cm. External and internal diameters of the bowl are 3.0 cm and 2.1 cm. The depth is 3.0 cm and this pipe weights 21 gr. Briar, vulcanite stem, no filter. The chamber has been protected with a break in paste.