4" matte green vase

I just picked up this little matte green vase. There are markings on the bottom, but they are very hard to make out. I'm pretty sure it's says USA at least so maybe it's McCoy or Roseville? The glaze has touches of brown to it. Perfect condition. The shape itself it unique with it's twisting ribbing. If you know who this is and when it may have been made I'd love to hear from you!

Julie