the 3 stars below the eagle means it was minted between 1917-1930 I would say it was a pedestal date and not recessed. Ped.datesare1917-1924. hope this helps to narrow it down some. Cause if the date was a pedestal recessed you would still see it since it would be stamped into the coin
brass and bronz is going for 3.75 a pound. If you don't scrape them sell to a museum and ask them to fund you dive site. May be silver and maybe gold down there. You will never know unless you go looking I would surely get one and research the markings and claim the site
pulley system is a clothes line the Amish and meninites used from the corner of there house to the top of a pull. Or from the top of a pole to a near by tree they do not like to carry the clothes to far hope that helps with the pully and also I would either say a building keystone.