This Fatty Roller is also known as a blown-out roller.  It measures 6 1/4 inches in length.

More Fatty Rollers have appeared in eBay listings in the last few years, so they're not quite as rare as once thought.

The dark green color is also uncommon in rollers.

Another interesting feature of this float is that the seal button is almost completely chipped.  There's only a pea sized seal left.

Found on Oregon coast.