Colombia 1960 UN Day 20c marginal block of 6 with major perf variety, 2 stamps with perfs passing through inscription, and two imperf between stamp & margin, unmounted mint and scarce
Colombia 1960 UN Day 20c marginal block of 6 with major perf variety, 2 stamps with perfs passing through inscription, and two imperf between stamp & margin, unmounted mint and scarce