1929 INVALID STAMP (QV 1D LILAC(SG172)/POSTAGE DUE. Large envelope (237x126) to Belfast with QV 1881 1d lilac (SG 172), not accepted for postage with manuscript 'Not Valid' and manuscript '4d to pay'. On front pair of 2d postage dues cancelled NEWCASTLE/BELFAST date stamps 16 JU 29. Filing folds clear of stamps. The 1d lilac was demonetised from 1st July 1915. (Ref 51554).