I am restoring a Lambert and have Lambert scripted lamps, see photos.
I suspect they are Corcoran , the Jno Brown measurements dont match, but they may have had earlier models
I need parts or better lamps and plan to move the scripted bonnets to the donor lamps
forks-7-1/2" c-c
front door dia- 9"..slightly less
body-6-3/8 dia
bonnet is 4"w x 4=-1/8" d with 4 vent holes and 3 rivets with 1-1/2 spacing
Tom Lahey
laheyth@gmail