Used 10oz Ball Ping(around here) Pin (over there) and Pen just because I have heard it called that. I see no markings on it other then 70 or could be 10.
Came in a box of tools I bought a few weeks ago, I cleaned it up with some vinegar/water mix, then soapy water. I am not sure the age, I bought 2 different boxes full of tools in the past month, I forgot which one this came from. I think this came out the box that was mostly 1940-50's era tools. The other box was earlier, 1930-50's era tools.

I have a couple other Ball Ping hammers, I never use, so this would just be an extra head in a box.