I found this darning bulb on Ebay a few months ago. I bid on it because it was interesting looking. My guess was that it was Fratelli Toso because of the 'chunky' canes even though they weren't like the canes in my other FT weights. The ground is aventurine but it has a greenish hue like copper does when it oxidizes.Mod: One image converted to link for ease of page loading & title altered.
I was puttering around on http://www.fratellitoso.it/
and found this: http://www.fratellitoso.it/img/1.jpg
It was made in 1902. Those yellowy-greeny canes are identical to those in my Ebay find.
So, either I have a paperweight that is about 100 years old, or I have one with 100 year old canes, or FT made those cane for a long time.
I like to think I have a 100 year old paperweight.