
The nine inch (23cm) square piece was given to Moyra Smith, a cleaner at Clarence House in London, by a royal chef in 1981.
The slice is decorated with the royal coat of arms in icing and was preserved in clingfilm.
It comes with a signed thank you letter to Mrs Smith from the royal couple.
Chris Albury, from the Dominic Winter Auction House in South Cerney, said: "We have seen numerous small pieces of official presentation cake slices from this wedding over the years but this piece is altogether on a different scale.
"The decorative icing of the royal coat of arms is very skilled and while there is some cracking and damage it is in remarkably good condition.
"We understand that 23 wedding cakes were officially made and this is most likely one from a single-tier cake sent to the staff at Clarence House.
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