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It is most likely the maker's initials.
NB or N&B could stand forNeustadt & Barnett, who were ring-makers from Birmingham in the UK in 1839.


If there is an SN somewherearoundthe NB, it was made byN B & Sn in 1941, London, UK.


It could also be theNayler Brothers (1926-1988).

Or maybe Needham Brothers (1901-1917).


The best way to get a proper definition of the NB is to ask aprofessionaljeweller.

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12y ago

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