so, thanks to @Noir I now know what the metal "ring" over the dial is...
lo and behold
The armoured acrylic crystal
adjustingvintagewatches.com
lo and behold
The armoured acrylic crystal
![adjustingvintagewatches.com](https://i0.wp.com/adjustingvintagewatches.com/wp-content/uploads/2021/01/IMG_20210126_151917-rotated.jpg?fit=1280%2C960&ssl=1)
Removing and Inserting Armored, Tension Ring Watch Crystals • Adjusting Vintage Watches
This post describes how to remove and insert armored, tension ring crystals into wristwatch cases.
![adjustingvintagewatches.com](https://i0.wp.com/adjustingvintagewatches.com/wp-content/uploads/2016/02/cropped-Bunn-Special-2-e1456493156817.jpg?fit=32%2C32&ssl=1)