Figural Bird Pin - 925 Castle Hallmark

[NatinNYC]

Trying to find out age and details about this mark. It says "925" and has what looks like a castle with two spires and something in the center of it.
The pin is a teal stone color (I don't think it's plastic as it's cool to the touch). I thought it might be green onyx.

http://picasaweb.google.com/lh/photo/QW ... directlink

http://picasaweb.google.com/lh/photo/qg ... directlink

[mudder351]

maybe you did this already but if not. See if you have a macro setting and turn the flash off and you should get a larger photo of the mark since this will allow a closer shot.