Chair

My wife bought this chair at an estate sale in Yreka, CA. It appears to be made out of oak using no joinery. Everything is connected with slotted screws. There is a number on the back of the chair, which seems to have been done by inlay.

I'm sure that the brass-colored casters on the legs are not period, as they have Phillip head screws and do not seem to belong based on attachment.

I'm curious what type of chair it is. What purpose it was designed for. And of course, approximate value.

Poor