This was listed as a bent billiardBoth Dave and Dan know a whole lot more about Castello, than I do. Is it a shape 65, or 63? Depends on the vintage. Current shape 63 is a 1/2 to 3/4 bent apple. Years about the shape 63 was a shape 65 with more of a rounded bowl. The 65 was a very billiard bowl and the 66 was a 65 with a diamond shank. Castello shapes have evolved over the decades and since each one is hand made, shape variations occur. Who really cares what shape number it is. It's a really nice example of a Castello.
Mike