Vintage Yashica Extension Bellows for Single Lens Reflex Camera

This is a vintage Yashica Extension Bellow for Single Lens Reflex Camera. All moving parts of this device are smooth and fully intact. I could not find much info on this piece online. There are markings on the front that say 100mm and 55mm. Nothing about compatibility, etc. The piece is in great shape and seems barely used if at all. It comes in its original box. Please zoom in on all photos for full details on this item.