This is a very unusual float.  First, the color is really striking.  It's a dark purple or deep violet color.  If you backlight this float, you can see lots of purple swirls throughout the float.

The seal on it is extra large, especially for this size float.

Even the size is an unusual measuring 26 1/4 inches in circumference or about 8 1/2 inches in diameter.

When I was offered this float I didn't know what to think.  I thought there was a good chance it was a reproduction but I bought it anyway since it came out of a collection with many amazing floats.  A couple days later the same seller showed me two identical floats but they were both netted.  There was a fitting on each of the nets with Japanese writing on it.  That convinced me that my float was an authentic Japanese glass float, too.

This float came out of an impressive collection from Augusta, Georgia sold in the spring 2023.