Lot 20190 – 1934 GPO envelope with bisected 1d postage due

POSTAGE DUES: 1934 GPO official envelope internal use bearing 1d postage due block of eight & pair and bisected 1d with no manuscript surcharge, with manuscript « 21 undeliverable bills @ 1/2d each enclosed » and signed by the postmaster (the bisect was only authorised for use between March 1934 and February 1935), very rare, cert. PF (1985)