Interior Optic, Imperial
I had not heard of this pattern before this 4 7/8-inch clear vase sold at a Tom Burns auction in 2019. It was listed as having the Imperial Iron Cross mark. It brought $70.
Another item that sold at a Tom burns auction, this time in 2022. Again listed as Interior Optic and in marigold, 4 3/4 inches tall with the top 4 1/2 inches across. It brought $20.

Updated 1/25/2022