Ooooooops, just realised that I called it a No78 sight and it's a No74.
The cover part is a bog standard L1A1 cover with the bracket part spot welded on although it looks like the spot welds have been puddle welded in place as well, probably as a strengthening ploy. I have shot an L1A1 with this sight up to 600 yards, the longest range that I had access to during a couple of 'lunch breaks'. However, while 1 and 2 equated to 1 and 200 yards, the 5 and 6 were way out so maybe the sight was calibrated in metres! The r&d MoA clicker arragements seem to equate to the No32
All the Armourers fired it free-hand on the 25yard armourers enclosed test range as a bit of a Friday jolly which they all enjoyed but it didn't make the rifle more accurate of course.
MUST be one of, if not the rarest L1A1 accessory after the energa launcher
Adjustment to zero is by loosening the two small allen screws on the top of each drum after sighting in then rotating range scale to suit the range and azimuth scale to zero. There is a small 'C' spanner to rotate the scales but another of those useless tools that are supplied but not requiredInformation
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