Here is the 1869 civil marriage record for Owen Kenny and Mary Rock. Owen is shown as 48 and a widower, If he was 48 in 1869 then he was born around 1821. Your note indicates your Owen was born in 1838. So possibly the 1869 marriage is for another Owen Kenny.
Thank you, Roger. You are right, the 1869 marriage is for another Owen Kenny. Mine is younger and was probably in San Francisco with the rest of the family that emigrated. Thanks for checking.