I believe that is the top of a Dung Beetle Commemorative ring. You can tell by the little ball of dung it's pushing along with angel-like wings. It's also pulling one with it's hind legs. Back in the 1800's with the expansion of beef demand and cattle grazing everywhere, there was a huge problem of stepping in cattle dung everywhere. It came to a head when a man tracked some into his home and his wife shouted at him, "Where did that cr@p come from?". He told her it was everywhere and he couldn't avoid it. A similar thing was happening to all the townsfolk. During a town meeting, the subject became the "Talk of the Town". It was decided the best way to get rid of all the dung was to import the Dung Beetle because cr@p was it's natural food source. The town established a "Dung Beetle Fund" and began importing them from South America, Africa and Egypt. After millions were released, within 2 months there was no more dung to be walked in or to be tracked into their homes. This was praised by all and they established the Dung Beetle as the towns savior. For years following the success, they had Dung Beetle celebrations the first week of August until around 1956. At this time, a new highway went through the entire area, displaced all the roaming cattle and killed all the Dung Beetles in the process. This is the price we pay for progress.
Nice Find!