if you take a close up of the iridescence on the side does it look as though it is 'crackled' ?
My Loetz Olympia pieces look as though the iridescence has been painted on with a very fine brush, in horizontal stripes, when you take a close up.
When Christine put up an Olympia type gourd shaped vase a few years ago, the iridescent finish was different and I think I found a reference to that being Fritz Heckert?
I'm just wondering if a close up of your might indicate something .... but don't know what

I wonder if there is a Loetz Shape match to it somewhere?
m