Very nice bike. Nice combination of original paint and patina. Cool rider!
The collar where the lower tube meets the seat tube is commonly found in bikes made by Westfield. The way the rear dropouts are finished where they enter the chain stays would also tell part of the story. That said, I only know what I know because the all the REAL experts around here.
I've been down this last February with an unbadged motobike frame I found. Turned out to be a Westfield built bike badged as Stormer. No idea who sold them or in what part of the country.
Serial number shoudl start with a letter if its a Westfield Columbia product. Maybe leftover WWI government contract frame repainted and badged for retail?
The frame looks similar to this Columbia Westfield Military Model from a thread in the Military Bike forum. Notice the collared lug(?) at the seat tube. Fork crown looks like a match too.
View attachment 1108771