Bigelow & Kinnard shade. The base is bent at the top. I would guess it's a standard size, 24" across x18" tall? It's packed away since I took the photos. Also have Handel hexagon lamp shade without a base. 4 of the 6 panels are cracked. I haven't a clue how about getting repairs.

These were packed in steamer trunks in a hidden room of my Grandparents house along with 30 framed prints and 4other trunks full of silver and linens. The house was built in 1898. The first occupants where Canadian. My grandparents about it in the early 1950s.