Luke Honey Ltd has dated this piece to the 1910s.
..The New Race Game...By Royal Letters Patent...DOUBLE EVENT...Sole Makers...John Jaques & Son Ltd, London...the interior including: a rolled cloth board, two packs of playing cards wrapped in red ribbon, coloured counters in red, yellow, blue and green, 8 painted lead racehorses by John Hill Co., and instruction pamphlet (dating from the 1920s), John Jaques & Son, Ltd., 20 & 21 Kirby Street, Hatton Garden, London, E.C.1.

44cm long, 17cm wide, 6cm high.
Stock Reference: AS 1878
The game was invented by E. St Clair and marketed by Jaques & Son Ltd as 'Minoru' in December, 1909- named after King Edward VII's horse which famously won the Epsom Derby in that year. This game is a further development of Jaques's "Ascot" (1891), but the horses are moved by the turn of a card, rather than by cords. This 'snakeskin' version is possibly a slightly later ‘austerity' edition from the First World War period.
Luke Honey Ltd has dated this piece to the 1910s.
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