Assembly.

step 1. take cut out circle from number ring, glue to center of back plate (make sure it is centered.) I score the circile on back plate so its perfect.

step 2. place the ring on the back plate.

step 3. after you put your image or text on front glue the two parts together. (use glue in center of back plate to avoid gluing the ring to the front.)

again apologize for lack of discript, am still learn read write again. hope all have great holidays

The face image was pieced together from google images and processed in creative space. Do not have License for resale made it for personal use. 

Red lines = Cut

Green lines = Engrave 

Blue lines = Score