This image is of another church nearby the ruined Great Stone Church of Mission San Juan Capistrano. This was built during the time of the founder, Junipero Serra, and is the only remaining structure known where Serra celebrated Mass.
Published by Old Mission San Juan Capistrano, California
The description states:
Serra Church 1776
Mission Altar carved from Cherry Wood
in Barcelona, Spain
OLD MISSION
SAN JUAN CAPISTRANO, CALIFORNIA
Founded November 1, 1776
–This is a handcolored version of an original black and white photo. Additional images of this chapel can be seen here. The card dates to the 1940’s.