UP CO USA Mark (photo)

by Jess M
(Pennsylvania)

I have an old planter that looks unique with the way the U is written. It looks like a sideways squiggly mark. I have looked all over the internet at the other pots that have the UPCO vmars and haven't found any that have the U different like the one I have. I can send picture if need to help me out.

Any help identifying it would be appreciated.

Thank You