Stop in for a cup of coffee

zkx14 said
How can you tell if its 6012 or 6014? This is the old ‘2’ optic Dan described. But I dont see a bulb #

On the older lamps I think its hard to know for sure if the ink stamps are gone.
I think at least for GE with a plain 2 and a wider flutes odds are good its 6012.
Could hook 'em up to a 12 volt source and an ammeter...