Ruby cut-to-clear lidded dish - age ? origin?

Not a pinwheel on it ! There seems to be a lot of these around. The 1st photo is the whole thing, next 3 the lid, 3 after that the body. As you can (hopefully!) see, the top of the lid is faceted and clear. The repeating design around the lid is duplicated on the body. I don't know what the swirliness the bottom shows signifies.
I wondering if this is from a well-known American manufacturer or European and if it has any age.

 

These are usually Bohemian made although some were also made in Germany - I wasn't aware they were made in the States, but maybe?

 

Is the BT in the final picture on the glass or a reflection?

 

The "BT" was some kind of sharpie ink on the glass.

 

A lot of these also poured in from Eastern Europe and Russia in the early 2000's.
Don