A new shape 15 Hand potted

This is my latest aquisition, good sturdy piece and 265mm high, heavier made than the white ones. The stamp is very hard to see under the dark green, I didn't even notice it when I bought the vase, I only bought it because of the 15 scratched into the base. When I got home and showed hubby under different light, I notice the  dirty mark on the base, was actually the tiki stamp, and can just make out the words Hand Potted.

Wow I don't think I've seen a green shape 15 before !!
Hopefully one day we can sort out these numbers as now there are 3 different Hand Potted shape 15, plus the C15 which looks like this one too.