A very fine used example of the 3d purple on pale yellow King George V stamp from the 1914-1922 De La Rue Imperium keyplate design, multiple crown CA watermark on chalky paper. The location is obscured, but the date is Feb 2nd 1916.
Included in the photos is a scan of every different paper back found for this paper color.
Gibbons lists a very fine hinged example at 15 pounds, (approximately $30). The stamp offered here grades 75 as follows:
