Abu Dhabi 1966: 20 F. On 20 NP. Violet ultramarine, overprint...

Abu Dhabi 1966: 20 F. On 20 NP. Violet ultramarine, overprint inverted, mint never hinged without hinge. Probably was only a sheet reversed overprinted, therefore rare. SG 17 ba. Catalogue no. 17 A K appraisal 400.- till 500.-

(via Philasearch.com - Abu Dhabi, Michel 17 A K)

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