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MONACO - 1956 IMPERF COLOUR TRIAL CORNER PAIRS. The Royal Wedding set as Yv 473/77, SG 578/582, each value as a single colour proof next to a bicolour proof, 1f magenta & magenta/black, 2f brown & brown/olive, 3f blue & blue/brown, 5f scarlet & scarlet/chocolate, 15f indigo & indigo/olive green, ALL values except the 2f are lower right corner pairs dated 06/03/56 a month prior to Official release date, never hinged mint. (5 pairs = 10 colour Trial Proofs)