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Small bowl/Large cup...?

Just purchased this from a second-hand shop, not even sure what it is. A few details:

3 1/2" tall
4 1/2" Diameter across the top
weighs 354g
is nonmagnetic
rings bell-like if struck
ice placed in it melts quickly - as if on a hotplate.
blue-black tarnish

So, it certainly seems to be high-content silver in terms of material; but it has no markings, either hallmark or decoration, and so I have no idea exactly what it is, much less from when or where. Any assistance on this would be greatly appreciated. Picture is attached below.
20160913.jpg

Without markings? Impossible to date or suggest usage I’m afraid.