vintage art glass swan paperweight figurine, teal / crystal clear glass Murano?

I love the teal green swirled color of this vintage glass swan, it seems to me like a color a swan would choose - cool and graceful.

This is a heavy, solid piece, about 3 1/2" x 3 1/2" overall. No makers marks or signature that I could see, though it looks like Murano glass to me.