Auction 333-341 Nigeria, Cameroon, Sudan & Worldwide Postal History - Day 4

Postal Orders: 1924: King George V, 20 s. red, 4 d. overprint type T3T, original poundage 2 d., GvR watermark (issued in Britain for a few months), large design, dated 1 August 1929, struck with a double circle "M.O.O. PORT HARCOURT", two heavy vertical creases and small hole in top above 'Y' of 'PAYEE'. The GvR watermark postal orders are rare and this is the only known surviving of this type.
Reference: The Postal Stationery of Nigeria, by Peter Hørlyck, illustrated on pg. 194 & 195.