Strip or sandblast the paint off, THEN take a look at it, is the original porcelain surface in good condition (every one I ever owned was badly chipped and rusted) leave it like it is, otherwise, sand it smooth and paint it. No need to remove the procelain.

Jack Sim

Author, 1st & 2nd editions of Gas Pump ID book, 3rd edition is now available at
Air Meter ID book also available