Amber and Wrought Iron Swag Lamp

I open the trash can on Xmas Eve and there it is. Not thrown in, set in all nice. Grabbed it right away. I love this style. Guessing 60'. Cleaned it up the best i can. I think it needs some new paint and I am replacing the wiring. The clear plastic on the wire was flaking off. Looks much better. It had like an inch of dust on it, like it was in an attic or something. I just LOVE the amber glass. It is gorgeous! I tool the chain off and unwired it. Easy rewiring job. Gotta find an old vintage looking cord though. Wanna keep the chain stock even if I paint it. This is a nice piece. I love it.

Click the closeup of the glass. Middle of the pic on the glass is a MARK. Looks like an Oval with a half moon out of it on the upper right. I think it is an artist/maker mark. Need help with this! Any ideas on maker, value, rarity, etc, etc?

CLICK THE IMAGE OF THE CLASS CLOSEUP TO SEE THE MARK BEST!