I have two 1943 U. S. Navy Clinometers Mark 4 Mod-0. These were made by the John L. Chancy instrument Co. in Lake Geneva Wis. I was told they were used during the war on a ship and removed after when the ship was decommissioned. I do not know the name of the ship. Both are all original and work perfectly. They would be a great unique addition to any boat or to any WWII collection. These sell for $300 on eBay see second picture. I am asking half that at $150 each.