Didn't find any buttons this time but the old flood control site finally coughed out a coin at 8". I believe its a large cent but no date is visible. I'm soaking it in mineral oil to see if it cleans up a bit. Where theres one there's gotta be more.
This thing is in pretty rough shape but after a little peroxide soak followed up with some vasoline you can pretty much make out the date...which I'm happy with.