I found this on another site. It explains the counterstamped coins better than I can.
In the 19th Century, especially from about the 1820's to the 1880's it was a common practice to counterstamp coins for any number of reasons. Sometimes businessmen did so to advertise their business...
How big is your creek. How deep is the water? Most creeks here in south Georgia are about 30 feet wide at the most and the water ranges from 3-15 feet deep. In some areas during the dry season it can be less than one foot deep. The hard pan is usually less than a foot under the mud and sand.
Did you post this button on a Facebook group? If so post that back picture here. It is much more legible. Looks like S & J ? ? Treble Gilt Stand Col to me.
Try shining a light from the different angles, even from the side, to see if you can read more. Or take a picture in daylight but not direct sunlight. The lettering in the outer ring looks like "Stand:Col: ????". That probably means standard color or colour if it is British.