ST LUCIA SG79b 1912-21 Wmk MCA 1d rose-red block of 18 plate number 6 U/M

1912-21 Wmk MCA 1d rose-red lower marginal block of 18 (6×3) being the bottom three rows of the right pane with plate number 6 fresh unmounted o.g. Folded vertical perfs at left but a useful proving piece from the August 1919 printing. (cat 162+) Purchased from Stanley Gibbons (still on their card)