Mail Bag! Roberto Memmo, anyone?

We got this email in the Mail Bag today from Annette who says:

Hi … I’m trying to find a way to contact Mr. Memmo the owner of Zaca. I have a beautiful watercolor of Zaca in San Francisco Bay … Any idea how I can reach him?

I suggested Luther Greene and the Sausalito Historical Society but can’t find Luther’s email address for the life of me! I once had a correspondence with a friend of Mr. Memmo, but that is lost, too, to the sands of time …