How old is this

I found this old battery in my house. I think it is from an old radio. We were having a talk over coffee about it, discussing how old it is with no definite answers/agreements on how old it is. Sooooo… We Googled it with no success. Any ideas?.. Is it dangerous to have around?..

I found and interesting article here:

“All early radios used batteries—as many as three batteries in the earliest sets. These batteries were known as A, B, and C”

Here is one similar for sale on Ebay: … 391wt_1397

It said’s vintage 1940’s…

Thank You…