Английская Википедия:Clock bag
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A clock bag is a bag used in bookmaking with a lock and a built-in clock, intended to prevent fraud by proving the bets inside had been placed before a sporting event had started.[1][2][3] The bets, or "lines", inside would often be "rolled in bundles each marked by a pseudonym".[4]
Clock bags were in regular use in illegal gambling starting during the 1920s.[5] In Glasgow during the 1930s, runners would collect bets in clock bags and then telephone bookmakers for the outcomes. This was a common practice called "shovel betting".[1]
It has been speculated that clock bags may have originated around pigeon racing.[5]
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