Modernist Gold Ring Hallmark N?

by Aleta
(Denison, Tx, USA)

I have a 14K Gold Modernist ring with a stylized "N" hallmark. This ring was left to me by an aunt who passed last year at 90 yrs old. I had never seen her wear it. I am dating it 1960's to 1980's but that is a guess.

Marked with a stylized "N" or 2 letters combined and 14K.
Can you identify the maker?
It would be greatly appreciated.
Aleta