Quote Originally Posted by VaultDoors View Post
There must be a light source in the Pennsylvania Treasury Vault periscope as the dial appears to be lit:

Click image for larger version.  Name: PA Treasury Vault (7).jpg  Views: 14  Size: 41.1 KB  ID: 10487

There is a "1" hand and a "2" hand on the dial that I suspect corresponds to each knob and since there are two periscopes this vault actually has four combination locks.
Here is footage of the #2 combination dial pointer in motion: https://www.flickr.com/photos/canton...57639509976233.
This clip is embedded in the Bank Vault Anatomy presentation.