GB 1940 SG462ab var Booklet pane (SPECIMEN type 23)
Stock Code: P15602603
1940 ½d Green (Selvedge at bottom, Wmk sideways). Very fine unmounted o.g. booklet pane of four (Perf type E), overprinted "SPECIMEN" type 23 and lower left hand stamp with additional punch hole. A unique pane in private hands, to be listed in the forthcoming Specialised Vol.2 catalogue as QB2as. Ex. NPM Archive.
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