Sterling Silver Earrings Marked "NN" ?

[Tammietired]

Hello again! I'm really not sure if these earrings are American or not but I can't think of what else they could be. I believe they are very old. The "NN" is the only markings other than "sterling". The "N"'s are a kind of curvy shape-not sure if that's relevant or not... Looks like it has onyx and pearls. Any help is always appreciated!

http://tinypic.com/m/b3og2x/2
http://tinypic.com/m/b3og7c/2
.

[tammym]

i also have a pair of nn earrings,the n's dont appear to be curved like yours, but they also say sterling. they are turquoise and silver. the only jeweler w that mark ive found is from denmark. niels nielsen copenhagen 1917 to 1937. i cant locate any further info on him to see his pieces. so i dont know if thats where they came from or not. im very curious. if u have found anymore info please let me know thank you!

[ReddWing]

It looks more like Z
2
Or 2
Z
Instead of N's to me.