This bottle was almost clear (maybe a tinge amethyst) when I put it on the south facing back porch last year. Not even sure where I got it; maybe I dug it. It wasn't interesting enough for me to buy at a flea market.

Seems to have the kind of top you'd see on a milk or cream bottle, with the indent for a cardboard cap. On the other hand it's a little fancy shaped to be a dairy...3 panels front & back, plus the sides. The base is embossed "WILLIAM"

The change in color has been cool to watch. I'm hoping the Hemi-21 gets the hint and tries to catch up 😁

Whatsit?

*edit to add...Someone who knows more than I suggests it may be a condiment bottle. In the interim, I did recall finally having dug this up at a farmhouse.