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ok sorry for the chaos, there might be something to this model after all. it does seem to be the same model as in this photo of Pilyugin and Lozino-Lozinskiy dated 1978

15/2/26, 1:03 pm1 repost13 likes

maks

@buran.space

15 Feb

and again the model in the NPO Molniya museum, showing a similar livery to the mid-80s illustrations of the almost final orbiter design

maks

@buran.space

15 Feb

by mid-1976 (or 1978) that final configuration (305-2 - right)) was approved, succeeding OK-92 (center), so if the model is of OS-120 (left), the configuration is out of date by 3 years. it could also just be based on the Space Shuttle shape, which by that time already had the short OMS pods