You might be tempted to call this "Jade Green" but since you can see some moderate milk swirling, I feel the correct color designation is "Milky Aqua".

The photo on the left is base & back lit and taken with a flash, the one on the right without a flash. As you might expect, the more milky to jade pieces photograph and present themselves better with front, not back, lighting.

This is the CD 257 PATENT/PATENT [020] {Wide saddle groove} {Hemingray product}. Any CD 257 PATENT/PATENT with the wide saddle groove s is quite a tough piece to find.

For reference, here is a [id=299512512; Light Jade Green] piece.