California Pottery Vintage Signed MCM Fat Lava Style California Pottery Drip Vase Made in USA

This gorgeous drip vase is a vintage piece made in the mid-century era. The drip glaze is in red, orange, and lime or chartreuse over a black base. It is a stunning piece in great vintage condition with only one small chip noted but may have actually been there since the glazing process. Defect shown in the last picture. It is signed/stamped/maker's mark on the bottom. It is hard to read but you can make out made in the USA. The other part I could not read or pick up with reverse transfer. Please ask questions before purchasing. Nonsmoking home. Thank you. MS: 4.75 base X 10.5 height X 5 opening Possibly on the bottom: F-23?; A-21?