Duncan & Miller #55, Quartered Block oil lamp, circa 1903?

Thrift shop find today for $8.50 including tax. It is about 9 3/4" tall without the burner. The bowl has numerous straw marks on the inside and outside of the bowl, but no cracks. The inside of the bowl was heavily coated with a brown film that turned out to be extremely soluble using dishwashing soap and water. I was really surprised at how easy it was to clean up. The burner was heavily coated in some red material that soap and water did not touch, but it proved no match for rubbing alcohol and cotton swabs. Still working on it, though as it was heavily coated.. I suspect it still has its original burner which is fully functional but has no markings at all.

I find this described a couple of ways in Internet sources:

"Duncan Quarter Block Pattern lamp. Ebling brass collar. One piece mold. Drip catcher feature around the top edge.
The lamp is listed in Catherine Thuro’s first book, Oil Lamps the Kerosene Era, on page 298 & 299, made by George Duncan’s Sons and Company, Washington, PA, circa 1893. "

and

Duncan & Miller #55, AKA: Quartered Block, c1903 (Cited from: https://www.antiquers.com/threads/help-to-id-this-glass-oil-lamp-base.1332/)