How old are these lead dice?

[Trunkman]

I found these two dice about 3 feet apart around 8" down. I had no idea what they were until I scrubbed them with a soft tooth brush. I believe they are made of lead as they are quite heavy for their size (.5" square).

I found them on a 1700s homestead. It was occupied by the same family until 1960.

Does anyone know how old these might be?

 

[CRUSADER]

I find Roman versions of these, so they have been around awhile.