According to Grant Romer, there is no evidence that Southworth had a camera with him in California during his visit there 1849-1850. This is not verified, but letters indicate he had no equipment for making dags and he does not mention making photographs in his letters to his wife. There are three California views in the S&H collection: this one, another full-plate of Beal's Bar, and a 1/2 plate copy of Beal's Bar (Feigenbaum sale). Romer, in conversation with MD and Jessica May, 7/13/2006. See also Romer, et.al., _Young America_ (NY: ICP/Eastman, 2005), p. 465. Cat. no. 1822.
By an unknown maker, this plate was most likely purchased by Albert Southworth in San Francisco, 18749-50.