Lot 20530 – 1970 Ludwig van Beethoven 20np colour trials in si

1970 Ludwig van Beethoven 20np colour trials in six different sets of colours (one in the chosen colours and signed adjacent), with a single and a block of four of each, affixed in a cardboard folder inscribed “Forwarded for selection of colours” and signed by the General Manager of the India Security Press, label affixed on the reverse indicating the colours used, very fine