I wonder if it's a gunsight that has been built using parts from obsolete equipment? It seems likely that the eyepiece assembly could be re-used, so maybe that's why the original designation has been struck out, along with the manufacturer name and date.
Is it really 21x magnification, or have they just pinned the selector in that position and it's really a fixed magnification unit?
The original unit may well have been a variable power telescope for observation (flash spotting or counter-sniper) purposes.
Chris.
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