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Where was it offered for sale? What price did it reach?

Never saw many TWIGGIES but they did have the identical rear end but the OG end was huge so as to give a greater FoV. I seem to remember that although the big twiggies had the grat zeroing stuff,...

It's not an L1A7 Gil. Way before that. I'd say an L1A1 or 2 or if it's fot the anti-tank grat pattern, then an A3 or 4. That sight is the very earliest type without the ABC - or Auto Brightness...