I do believe that was a building (pink) in Belmont that was being demolished for the railroad grade separation for Caltrans, at Ralston Avenue and Old County Road. Sometime between 1995 and 1998.
I saw the guy holding up that bucket. He said it had to do with the Spanish-American War.
Building used to be a butcher's shop. Among other artifacts, they also came up with some old receipts for the store.
This was where the new Police station went in. That park adjacent to it coughed up a pile of seated liberty coinage to my friend and a few guys he hit it with frequently. It used to be where the SF wealthy would daytrip to picnic and camp around the 1860/70’s. He said he never found a penny there (IH or Large cents) from that era, it was always silvers, including 3 cent pieces (fish scales is the slang for em) and half dimes.
I should hit that place again sometime myself...