creek finds

Yesterday I went on a walk to the public creek just down the road from my house. It was a very low tide so I decided to walk the shoreline and see what I could find. I ended up finding a couple of cool things from one of multiple sites where I believe there are old dump/wash-up sites. The finds...

One of the pictures is a shell from a Winchester Shotgun 12 Gauge repeater possibly from early 1900s. Found about 4 inches down near a creek. The other picture is a thick leather belt or strap with a metal hook and buttons. No lettering or marking noted on the leather or buttons. Unsure what...