145567 1884 1½D LILAC (SG188) 'STUDY OF PLUG VARIETIES' x SIX.

1884 1½D LILAC (SG188) 'STUDY OF PLUG VARIETIES' x SIX. Unusual study 1884 1½d (SG188) with three unused and three used examples, including four examples all lettered FA illustrating progressive plug flaw on 'A' at lower right one without plug flaw and three others showing the flaw, also used example lettered NI with plug flaw on 'I' at lower right. Sixth stamp unused example lettered NB with unusual thinning to check letter 'B' at lower right. Unusual group with accompanying article. (6 items). (Ref 145567).