My wife bought this several years ago at an auction. The story was that years before then an engineer who helped put in a sewer system brought it back from Italy or Greece, can't remember which.
The stone may be marble and is 5 3/4 inches in diameter. The edge views have each been sequentially rotated about 1/7 turn to the left. The first and last couple of images duplicate.
The stone may be marble and is 5 3/4 inches in diameter. The edge views have each been sequentially rotated about 1/7 turn to the left. The first and last couple of images duplicate.