LIBYA STAMPS (14 November 1977)

1977 "World Standards Day" three stamps 5-15-30 dirhams with the same design.
Info: https://en.wikipedia.org/wiki/World_Standards_Day
EBAY: http://stores.ebay.com/libyan-philatelic-center
DELCAMPE: http://www.delcampe.net/stores/philatelicum