Mrs. Ray Dix of the DAR typed up abstracts of early Stanislaus County documents in 1958, back when typing was manual. It is 300 pages and a labor of love. It has:
William McKay, over 21, resident of Stockton [San Joaquin County, California] born in NY, marries MRS. Ida L. Gann, over 18, resident of Stockton, native of California on 9 Apr 1904; ceremony performed by J. C. Robertson, Minister of the Gospel. Stanislaus Marriage book VI:79.
No explanation about the "Mrs", no clue as to how far over 21 and 18 the couple were.
If William Gann left a will, it wasn't in the book.