Exhibition page with a complete sheet of the 1927 ½ a yellow-green on thin brittle wove paper perf 7 with cliché arrangement (1,4 / 2,3) with error middle column of perforation missing resulting in two imperf between horizontal pairs. This being the unique discovery sheet. Also a normal sheet wit the same previously unrecorded cliché arrangement, certificate ISES 2021 (SG value £5000)
