I have one in 450-400 3 1/4. The article is incorrect as to the majority are in 450-400. All the ones I have seen other than mine are 450 NE. My letter from Cogswell and Harrison indicates that mine is the earliest known to exist. It was completed in November 1900. Cogswell and Harrison has one in 450 NE for sale on their web site but it is in need of restoration. It is really an unusual design but it works well.

Mike Davis