I have been trying to find more information on flint wallets, but not finding much. I do have some images, but there are no early to mid 18th century examples and some images show very little of the pattern.
A flint wallet is used to secure spare gun flints for use in flintlock guns.
Made in Oxford, Oxfordshire, England, late 18th c. Made of leather.
National Maritime Museum, Greenwich, London.
Red leather flint wallet.
From a cased set of Manton duelling pistols, 1792.
Joseph Gulley, London. Superb pair of 24-bore (.58 cal.) English Duelling pistols by a best London maker, ca. 1800.
This quote below obviously referring to a woolen flint wallet.
Quote only, no image available:
"An 18th century Continental felt flint wallet (moth damage)".