Super lovely. I love an apple in any form, but especially a green one, and even better as a vessel. Surely nodding to old Japanese turned and painted wooden ones, which often held games inside, this one is a studio pottery work, signed on the underside and dated 1977. The green is almost a celadon, with tiny dark flecks just like the on the skin of the fruit, and pure white inside, like the flesh of a crisp one. 

 3" t x 3 1/4" x 3 1/2" and in very good condition, maybe just a little lost to the brown of the bisque stem on one side.