2X Doubler for B&H 16mm Magazine Cameras (c. 1956)

item #BHauxdoublerfor16mm. This is a screw in 2X doubler for B&H 16mm movie cameras. I think it fits a 1956 B&H 200EE camera but I am certainly not sure. The screw in threads are approximately 27.5mm. Condition 7-.