Scherenfernrohr S.F.14 marked bmk

Rare original periscope or Scherenfernrohr S.F. 14 in very good, almost mint condition. The periscope has clear sight and retains almost 95% of its original factory finish. The periscope is nicely marked H/6400 and bmk which indicates production by Srb & Stys Fabrik Praziser Messinstrumente, Prague. The optics of the periscope are all clean and useable! Great example which is hard to find in this condition!