used 2½a. black on bright yellow, imperforate horizontal pair, used with "MOMBASA/A/AJ 16/94" squared circle cancellations; fine. S.G. 7bb, £400. Photo

Details
used 2½a. black on bright yellow, imperforate horizontal pair, used with "MOMBASA/A/AJ 16/94" squared circle cancellations; fine. S.G. 7bb, £400. Photo