Marble Carved Ashtray Art Deco

At least I think its marble! (I’m not a marble expert). Either way it’s carved out stone of some sort. Please notice one corner has a small dent in it. See pic. (Also, upper left hand corner edge in 1st pic). 4-5/8” square, 7/8” tall Not into paying shipping for just one item? I get it…. Bundle & Save. Peruse my 3,000+ item selection.