The arrangement of drainage holes, and the shape of the pot remind me of some "low end" cast or molded Chinese or Taiwanese pots. Not a high quality clay and the original model for the shape of the pot was from an era before the emphasis on good drainage. The painted glaze does not look like anything I have seen, not Chinese, not Japanese. RockM may be exactly right. It could be a product of one of those "come in and paint your own" hobby ceramic classes. Who knows.
Assume this pot will not survive freeze-thaw cycling. Use it only for tropical or sub-tropical trees where it will not get frozen.
There is nothing wrong with using it, if you like the look under one of your trees, or as a pot to hold a mixed planting, like a kusamono. Nothing wrong with it. It may be an uncommon pot, but it is unlikely to be a valuable pot.
Put something gaudy in it, Chrysanthemum, or a shrub rose, or something that blooms with bold colors to counteract the bold glaze.
