'Other' Construction and Allied Systems Info & Downloads
Konstruktor(6) was almost a clone of 1960s Meccano, except that the hole spacing was 12.1mm. The parts numbering was different to Meccano. It was made in Russia by the Chelyabinsk Plant "Pribor" (Челябинский завод "Прибор") during at least the 1980s.
Info from the Metal Constructional Systems Database for KONSTRUKTOR 
Hole pitch <12.7mm
Bolts: cheese (slotted)
MECCANO-like parts & models.
The MCS document for this system is shown below. It can also be downloaded to your computer if desired here
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The report can be zoomed into, made full screen or downloaded as a pdf document by using the controls provided
Info from the Metal Constructional Systems Database for KONSTRUKTOR [4A]
--- (Screwed Rods or Bolts are used as axles.)
Set similar to KONSTRUKTOR  but coloured parts, & thus it may be earlier. The Windmill model shown on Ebay is identical to one for KONSTRUKTOR  but crudely drawn.
Below there are manuals/leafets which can be downloaded by clicking on the appropriate image.
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