Ichendorf glass vase Vase Horst Tüsselmann 60s 70s modernist design

A tall and heavy crystal glass vase - by Ichendorf / designed by Horst Tüsselmann - um 1960/ 1970. Extremely thick-walled glass quality, with dark-grey inlay.  A highly-interesting piece of art glass in clear, timeless design. I think the photos  show it pretty well.

It measures:

Height 22 cm/ 8.66"

Base 8.8 cm x 8.8 cm/ 3.46" x 3.46"

Condition. Used, but in very good undamaged condition with only minute traces of use (from pushing).The fine score underneath is ex-work, no damage.