See scans.    REDUCED FROM £1550.  The discovery copies of an exciting error.   

Abu Dhabi 1971 5f on 50f surcharge in green but DOUBLE SURCHARGE, one albino.  

Ultra-rare, these are the only existing examples so far discovered.   

David Brandon Certificate, and letter from Stanley Gibbons confirming the error will be listed.   

To be included in the SG Middle East Catalogue 2nd Edition due October 2021 as SG 80c.   Will be unpriced as there is obviously no data on sales price.  

The successful purchaser will obviously have the option to split the pair and consign one to auction to offset the purchase price and establish a value.