Originally Posted by
Peter Laidler
UIC indicates United Instrument Co who were a group ofsmall sub contractors who did loads of the smaller piece work for Vickers, bought together just for the war. TYheir serial number issue batch was 1 to 1000 but we really don't know where they got up to!
When we modified/upgraded Mk2 scopes to Mk2/1, we would bar through the 1650 number and insert 1400 GA and mark the /1 after the Mk2..
There is a way of telling whether a UI Mk2/1 is an original Mk2/1 or one that has been upograded from Mk2 to 2/1 but I won't tell all..............