That is a great stamp! A worn plate so has an Stanley Gibbons number of S.G.9. Just a quick look and it appears to have a basal shift too (your"ink extends beyond frame lines" reference). Not possessing the greatest eyesight at the moment means I cannot see if there is a re-entry so get a slightly better scan so someone else may spot something. Will try to plate it later as there might be something in Gibbons about the appropriate plate varieties.
Plate 57 with a basal shift. No re-entry. Stamps with check letters NA to NK will all have basal shifts. Nice one.
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