1933 Balbo Flight opt $4.50/75c yellow-brown, blk of 4. Superb fresh MNH. Unitrade C18 cat C$3600+. SG 235 cat £1100 for M singles, should be at least double, £2200+ MNH, plus premium for blk. Rare multiple for specialist showing full opt setting of 4 types & certificate can be obtained on request. (P) (Image1)

Estimate AU$2,500