These appear to be Victorian era outdoor chairs !! Each piece is cast then attached with screws or bolts,,is that correct ?? If I were to guess,, it looks like original paint on this one or can you see any other color between the top coat and the bare metal ?? If you re-paint you lose 30 to 50% of any value !! I would leave them as is,, just clean them with any good spray cleaner then let dry, apply a light coat of oil, then wipe off excess well !! They are charming as-is !! Where did you find these chairs ?? Can you post a pic of the other one ?? Are those ball & claw feet ?? Look on the underside of the seat or on the cameo back for a foundry mark !!