It could be an Ambassador Elite. 132-0240-CP. Cold Cartridge E-507176N, Hot E-507175N. I think you may have two types one has folding spout, the other a shower head pull out spout with separate faucet. I'm not sure about that one but might be a transom hot cold 136-0106-CP. Cartridge E-507664.
Google Ambassador Marine and go to their Downloads. Look under Parts List and choose either 132-xxx or 136-xxx. Choose the numbers above and view the PDF's to see if they look familiar.