984xxx is in the block of numbers set aside for 4x5 Crown Graphic. There should be a 3 letter/number date code on the bottom of the front most cross bar of the rails.
probably a late 1960's or early 1970's Crown Graphic.
The service manual, http://www.southbristolviews.com/pic...vicemanual.pdf , lists the part number for the bellows as 31061G3 with no distinction between Crown and Speed. The side rangefinder manual lists the bellows part number as 31061-G1 and no longer available, use 31061-G3 and use retaining clips 32459.
Some pictures would be nice but I'm guessing the bellows are for another make of camera that the back can be set to portrait or landscape position where the Pacemaker Graphics are fixed at landscape position.