Offered for sale is very rare – late war experimental ZF4 scope manufactured byVoigtländer - "ddx".This is mint - all authentic and unmolested example of extremally rare type ZF4 scope with only hand full of known examples known to exist. This prototype has a threaded objective lens mounting ring screwed over the body, secured in place by 3 small set screws, having an annular abutment groove which is far deeper and set 10mm further to the rear than the standard ZF4 scope.Scope ...also has a "gas plug" which is typical for the last made Voigtländer scopes.All knobs work excellent, optics are clear and sharp 10/10 – excellent. Condition as visible on presented photos - pristine and all authentic in 99%.It is unknown if those scope were design and tested to be issued with Mp's K98 , K43, or F g 42 since very little data exists about this specimen .On pictures I am comparing this scope to classic ZF4 scope, this one is shorter for about 3/16" Please ask questions and look at pictures before bidding.I can provide more pictures for request. All sales are final, no returns. Check my other auctions for WWII G43 stuff. Thanks