Excellent example of a Narrow Collar Jumbo Roller.

As the name implies, the collars (i.e. two grooves) on this type of jumbo roller are narrower than the other styles of jumbos.  It's the most easily identifiable characteristic of these floats.

The Narrow Collar Jumbos are presumed to be the oldest of all the jumbo rollers.  Most of them show heavy signs of use as working floats.

There's a dot in the middle of the non-seal end.

This float has an interesting provenance.  It was purportedly found near the mouth of the Umpqua River, Winchester Bay, Oregon USA.  It was found on Dec. 24th, 1930.  This float was hung in the Umpqua Lighthouse for many years.  When the lighthouse was remodeled, a very tenacious float collector obtained this float from the lighthouse.

This float has excellent provenance having come from the ex-Jim Watson collection.