I uber like that buckle! Yes, life has given me the opportunity to move to San Diego from the Midwest. Then I am thinking I move out to the west coast that's it for detecting the old stuff. Then I see your finds and it sorta makes me feel better.
They are actually regular belt buckles (not sash buckles) They (belt and buckle) were worn on pants and were actually sold with the pants in many cases.
Yes, it is a night hunt. Hear all the cars in the background? That is why we hunt this site at night.