That looks just like my faucet except ours is the burnt copper finish.

Here's a picture of our faucet:

Here is the information for the faucet, and where to call for help, they are near San Diego California.

Sigma Single Lever Kitchen Faucet - 1.3695020

Replacement cartridge: 18.07.144

American Faucet and Coatings Corporation
3280 Corporate View
Vista, California 92081

Customer Service:1-760-598-5895
Toll Free Fax at: 1-800-621-8383
Email: customerservice@sigmafaucet.com

Ours starting leaking where it swivels, It did not leak when it was shut off. They sent a cartridge but that was not the problem and of course did not fix the leak at the swivel. They then sent me a whole new faucet even thou the other was 4 or 5 years old (Free)!!! They did try to help repair it on the fone, but "THEY" (the faucet folks), thought it best to replace it----GREAT SERVICE!!!

When comes time to redo the bathrooms, I will certainly buy their faucets---new (replacement faucet has been trouble free---and now we have added soft water to both the hot and cold sides as our water here in S Calif is horrible!!!! it came out of our faucets in "Chunks" before we added the whole house water softener and I'm sure that was the cause of the faucet leaking at the swivel after 4 years or so.

Good luck with yours!!

Gary

Awesome Gary!
Thank you so much!
John