Ahh I didn't think of the mark being on the missing piece. Do you have a link to the complete lamp?
No logo to be found. Should I assume it's from the 60's then?
Thanks for the info on dates. It isn't signed. Any comment on the odd shape of it, or does it just mean this it was crimped by hand?
So I Googled everything I could think of and ultimately found people calling this pattern "Cabbage Rose". The only similar pieces I found are...
Separate names with a comma.