This is a Northern Pacific Adlake 250 Kero lantern. Cast on the rim with N. It has patent dates of 1911, 1913, and 1922. Clear cast Kopp circled K globe, that is etched on both sides at some point in its life with RR we must assume for railroad! Has a nice replacement copper tubing bail (handle). Lots of original metal shines through-this lantern lead a very easy life!