Red capped aluminium cocktail shaker juicer
 
Description Red capped aluminium cocktail shaker top with built-in juicer
Material Metal - aluminium
Diameter External: 100 mm, Internal: 94 mm
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Maker Not known
Mary Walker No. Not listed
Notes Top of a cocktail shaker.
I have a few of these all without bases suggesting that it may have been a stand-alone itop to sit on any glass.