Quote Originally Posted by Safeone View Post
Why does the door in the botom left picture have a sign saying "do not touch without gloves" ?
Sweat and oils from hands can be corrosive to a variety of metals and alloys. You can see the results of handling the door to the left of the time lock, and above: rusty, dark, stained metal. Since the site is now a museum, artifacts should be protected appropriately.

Older doors (including day gates) often had handles made of wood, plastic, or other material, and bank managers were supposed to use them instead of the steel parts. This issue became less important as stainless steel came into use.