This is a rare one. From the earliest years of the Southern Pacific Railway. Glass has crack as shown. No markings on the frame.
Has P&A (Plum & Atwood) burner as shown. I have no clue but the guy definitely seems to know his stuff. This lamp came from a 70 horder/collecter who is having to sell everything now due to problems with the county. He has a lot of great old stuff that has not seen the light of day in many many moons.This great ol' SP was part of this collection. We are not lantern experts. Offered as is as shown.