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During the 1980s, chocolate producer Cadbury commissioned the royal goldsmith Garrard & Co to create thirteen 22ct gold eggs for a treasure hunt labelled Cadbury’s Conundrum.

A dozen were hidden at secret locations across the country, with clues to their whereabouts included in a book written by Don Shaw, while the 13th and largest was awarded to a Cadbury’s retailer. This egg is now being offered on the market for the first time in Batemans’ July 1 sale in Stamford.

Weighing 323.6g, the enamel decoration is based on the front cover of Shaw’s book, incorporating elements of each riddle. It is estimated at £10,000-15,000 and will be offered with its original presentation box and a 1983 copy of Conundrum, The Cadbury’s Creme Egg Mystery by Shaw.

batemans.com or see this item on thesaleroom.com

More from the collection of Second World War flying ace ‘Johnnie’ Johnson will go under the hammer at Cheffins on July 6 in Cambridge.

From this latest batch is Johnson’s diary, which details both domestic and RAF-related events, and two watercolour and charcoal drawings by the artist Olive Snell (c.1882-1962). Men of the 610 Squadron was probably started towards the end of February 1943, while the squadron was based at Westhampnett, a satellite airfield to the main base at Tangmere in East Sussex.

Of the 18 pilots depicted in watercolour, four were killed in action within as many months. The pair of drawings is estimated at £7000-10,000.

cheffins.co.uk or see this item on thesaleroom.com

A pair of original celluloids from Walt Disney’s Snow White and the Seven Dwarfs is going under the hammer at Derbyshire saleroom Hansons on June 30.

Dating from 1937, the 15 x 16½in (38 x 42cm) cels depict a frame from the poisoned apple scene (pictured here and guided at £10,000-15,000) and another of Snow White surrounded with animals (estimate £5000-8000).

The cels are presented in their original period frames, unopened with gallery labels.

hansonsauctioneers.co.uk or see this item on thesaleroom.com