This colorful five-stamp Postage Due series from Guernsey Bailiwick features the iconic view of Castle Cornet overlooking St. Peter Port Harbour. Issued around 1971, these stamps were used to collect unpaid postage, with denominations from ½p to 4p. Each value is printed in a distinct hue — purple, green, red, blue, and brown — and bears the bold inscription POSTAGE DUE above the design. A fine example of Channel Islands postal administration and local heritage combined, this set is a must-have for collectors of British regional and postage due issues.