First time post.... I need help to verify the movement of a pocket watch. It is private labeled as Starr & Marcus. I think it looks as if Jules Jurgensen manufactured the movement. Any insight on the maker of the movement and the type of movement it is would be very helpful. The movement size is 12s. One thing I did note on the movement which may not be seen from the photos. The pallet fork is extended past the fork to the escapement wheel, at the end there is a hoop, or circle that is approximately the same diameter as the escapement wheel. The upper gear and pivot of the escapement wheel are centered inside this hoop. I am not sure of the function of this hoop, and if it is strictly ornamental, or serves a purpose. Any help from the pocket watch collectors out there would be appreciated. My wheel house is more wrist watches, but now later in my collecting career I am beginning to see the fascination with the pocket watch. Thank you in advance for your help.