hard top Q's

we recently bought a new member for our jeep family. it is a 1958 cj5 with a factory hard top. i've never seen one like it. the top is fiberglass and is removable from the sides. also the rear window opens and then slides in and locks so you can drive with it open. the doors' windows are only able to go up and down manually there is no window crank also they lock in whatever position you leave them in with a weird lookin lock. i have no pics of it and tried to describe to the best of my ability does anybody know what type of top it may be?