1861-70 Britannia 1/- blue ERROR OF COLOUR (instead of brown-black), no wmk, rough perf 14-16. Fresh UN, couple expertly repaired perfs at right, superb appearance with bright colour (and far above average condition as most known examples have trimmed perfs & are discoloured from removal of pen cancels). SG 34a cat £18,000. Great classic rarity with only around a dozen recorded. PF/NY photo cert. (P) (Image1)

Estimate AU$12,000