This makers's mark is undocumented. It has four Japanese symbols with a circle in the middle.  In one quadrant there is the katakana symbol A ア.  In another quadrant is Sa サ.  There's also Ha ハ and Ra ラ. 

Counter-clockwise it would be 'A Sa Ha Ra' but I have no idea if that was the manufacturer's intent.  The largest glass float producer was the Asahara Glass Company but it's worth noting that the Asahara Glass Company did NOT mark their floats. So who produced these floats?

There are other A Sa Ha Ra marked floats out there.  Case-in-point, WP #218 has the A Sa Ha Ra characters marked twice on the perimeter of 2 3/4 inch floats.  I've also seen examples of A Sa Ha Ra, with each symbol stamped in a different quadrants of the seal button.

What makes this float unique and undocumented is that it has a circle in the middle of the four katakana symbols.  I have two of them, so I think this is a verifiable mark.

As with many things in glass float collecting, the origin of these floats remains a mystery to the author at this time.