Who can shine some light on my little egg cup, any help would be great. Thank you
In the absence of any other marks, I would guess that it’s nickel silver - hence the “NS,” which, despite its name, contains no silver whatsoever. It might be silver-plated, but the lack of an “EP” (for electroplated), or any other maker’s mark, suggests that it’s not plated.
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Thanks buddy! I have spent most the day trying to find out about it. I’m not sure what the symbol is either a bee, bell or shamrock. I would love to find out more about it.
It tests as silver or epsn. Only done s bleach test
That’s where it gets tricky. Silver plate is, in fact, plated with a microscopic layer of real silver. So, a test that examines only the surface will produce the same result with silver plate as it does with solid sterling.
To do a proper test, you’d need to gouge the underside somewhere, so you could get at the layer beneath. These days. X-ray fluorescence (XRF) is a better, non-destructive option. Pricey equipment, but handheld versions are often in the hands of silver scrap dealers, pawn brokers, or jewelers. Quick and simple.
My money is on “plate,” or maybe just straight nickel silver. 
It’s a very attractive little cup. Polish it up, enjoy it, and don’t worry too much about its precious metal content, or lack thereof. 
I have little interest in it been silver, as it is a little beauty and I have already use it. But I would love to know its age and who the maker is. But thnk you for all your input buddy happy holidays