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

1931: Stationery Envelope, 1½ d. orange, final colour Proof, complete envelope in the issued colour, marked "G req 4973", "appd for colour", initialled and dated "15/4/31". Vertical filing crease left of centre and pin holes from being affixed to the file. Scarce. Comes with an unused example of the same envelope.
Reference: The Postal Stationery of Nigeria, by Peter Hørlyck, illustrated pg. 392.
Provenance: Robson Lowe, 21 December 1978, lot 1325 (which included the die proof).