I only created two of these complete sets of six matching covers which feature the famous Machin effigy of the Queen in negative. Each cover bears one of the six collectors strip values issued by the Hytech machines in use at Autumn STAMPEX 2011. This set bears the six stamps from a collectors strip issued by Hytech Machine 92 (the other set I produced used a strip from Machine 94).
The stamps have each been superbly cancelled by Royal Mail using a special, one day only, "50th Year of Machin Stamps" postmark for WINDSOR (incs picture of Windsor Castle) dated 22nd March 2016.
Obviously a rare set of covers and I'm confident the wide interest in GB Machin stamps will mean these covers become prized items in future.
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