I would say that your jar is about 1920s. That green color is neat!
I have an -Atlas- Strong Shoulder in a Light Pale Blue (One of only two fruit jars I have dug whole so far).
Here is mine I think it's earlier than yours:
Yeah, yrs is definitely an earlier one. '20s is fine with me, tho. Thx for putting an era to it. I don't find much from that time period. This one I bought off a guy who works as an excavator. He collects as well, but sometimes I buy what he doesn't wanna keep. The green just caught my eye.