OP Pottery Planter

I am not sure if OP is the same as OPCo. I thought at first it could be CP but look at enlargement #2 and it is an "O" and I've used a magnifying glass and powdered chalk to get the full imprint. The finish and texture is different from the CP pottery I am familiar with, because this has a rough finish and their's is usually extremely smooth and highly glazed. There is no damage, but a lot of manufacturing roughness around the rim. It is 6 1/2" in length and 3 1/4" in height. I need your zip code to calculate the postage.