MCM tulip form vase unbranded artist signed

Pretty pottery vase unbranded but signed by the artist R Allen. The vase is in very good condition without any chips or cracks. I purchased quite a few pottery pieces at a local Ohio estate sale and many of the pieces were by this artist. The vase stands approx 7” tall and is 5” wide. Please see photos as they are intended to be part of the description. Thank you for looking!