Found these marriage records:

John H. Potts of Yountville, age 46, Susan Church of Yountville, age 36, married 14 Sep 1876 in Yountville, Napa County, CA. He was born in TN; she in NC. Married by Frank Giffin, J.P.; witnessed by S. C. Brown, M.D and Mrs. S. C. Brown of Yountville (Book B Page 171 Napa County Marriages)

William Lee Burkett, 27; Tillie Armanini, 20, married 12 Nov 1905 in Napa, Napa County, CA by R. W. McKnight, J.D.; witnessed by David Cavagnaro and Amelia Amanini. They were both born in CA; his father, MO; mother, NC; her father, Italy; mother, NY. Neither were married before (Book 8; P 300)

J. D. Boggs, 30, Lillian M. Burkett, 20, married 15 Apr 1890 by Jas. Mitchell; in St. Helena, Napa County, CA; witnessed by E. H. Baldwin and Carrie Church. He was born in CA; she in MO. His parents bornn in MO; hers NC (Bk 4; P 280)

I believe J. D. stands for Jefferson Davis and was a bookeepper & teacher. Listed in Great Register; same birthplace and age fits.

Christian Burkett is in Great Register; 1880 in Yount; 1887 and 1892 in St. Helena; farmer; teamster