£150
1951 1d Light ultramarine watermark inverted imprimatur (SG504wi var)
1951 1d Light ultramarine (New colour, SG504wi var). Superb unmounted o.g. left hand marginal imperforate imprimatur with "N.P. IMPRIMATUR" handstamp on reverse and inverted watermark (ex booklet pane). Scarce.
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