Identifying older faucets can be challenging, but it is possible with some detective work, and may be necessary if you're remodeling your kitchen. Chances are you'll need some outside help identifying your faucet, especially if it has no obvious markings or recognizable characteristics. Consider shooting a few pictures of the faucets to aid professionals in helping you identify your faucet.
Examine the faucet for a brand, part number or trademark symbol. If no identifying symbols exist, take pictures of the faucet from multiple angles. Sometimes a faucet's distinctive shape provides clues to its identity.
Visit your local hardware store's plumbing section. Check their faucet displays for any that look similar to your faucet. It's a good idea to get the opinion of a plumbing expert if not a professional plumber, but this matching of products is a good place to start.
Locate a work order or receipt for the faucet. If the faucet was installed by a certain company and that company is still in business, they should have a copy of what sort of faucet was installed in what room, along with the brand name and parts number. This can require a lot of detective work finding out who did the installation, when the work was done and hoping that the records are still intact, but it can give you a direct result.