They opened in 1942 and the fact that all 3 numbers are shown to start the telephone number instead of two letters makes me think later, all my Paterson stuff from the 40-50's has the two letters before the third number. It's not until the mid 60's that I find three numbers...cool piece...
George,
I don't remember seeing the Quality Checked logo on any of their milks except square quart pyro's and cardboard squares. It was also on their ice cream containers. I live less than 20 miles from where their plant was. The building is still there, but they were bought out by some huge Texas conglomerate and moved.
No earlier than late 60's/early 70's, I would say.
Bring that to the Flint show and it will definitely sell. Just don't under price it. :>)
Bill