We installed this fixture 3 or 4 years ago.
The source was an online reseller called Faucets Online and it was in their section called Olde World Plumbing. As you may have guessed, they're not in business any longer and I can't find a match for the faucet.
I've tried Sign of the Crab which looked similar but after they inspected it, they said their diverter and valves are a different size.
Its #10 in chrome on this page http://www.faucetsonline.com/tub.html
I'm hoping to find a replacement diverter in ceramic but the local plumbing shops don't recognize what it is.