sweet lamp! it's older than my GE F14T12/D from the mid 50s since this has older brass endcaps. I'd say this is from the 40s-early 50s. Do you plan to shine up the brass to put it back into its original condition? That'd look AWESOME!
im gonna leave it as is.. polishing a collectible like this is not really a good idea. I am uploading video of this as i speak. I am AMAZED that a 1945 lamp still works!!
Watch out for the beryllium phosphors though.