There are several characteristics that make this 5 inch float special.

First, there is an amazing drip of glass that frozen in time.  I call it an 'Icicle Drip'.  It's an unusual wanna be spindle.

Next, this float has an undocumented mark.  It's comprised of three separate symbols.  It begins with a symbol similar to Tokui on the right side, a Sa in the middle, then another Tokui-like symbol on the left.  (I've got another float with this same maker's mark in a perfect stamp.)

There are also some faint amber swirls in the glass.

Plus it has two seal buttons together making for a double seal.  This is probably where all the extra glass came from to make the 'Icicle Drip'.

Add in the desirable 5 inch size, swirling in the glass, and tons of bubbles.  Yeah, this float has a lot going on!

Another one of my favorite floats. 

This float has excellent provenance having come from the ex-Ramon Fulton collection.