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It's a shaker in the shape of an Asian sandal, Japanese, most likely mid 20th century. Sometimes there will be a matched pair of shakers, sometimes the set will have one shaker and the other sandal will be an open salt with a glass liner.
Heh, fairly easy area for me, my Mom has collected open salts for many years - and I've researched all of them for her (there are so many, it's the only way to keep track too).