Writing on the wall showing the work of the people that counted the coins in the vault of The Old Mint.
Herman Safe Company, a native San Francisco campany until the 1940's, built the vaults for the The Old Mint
Facilities Manager Art Ferretti points out the granite blocks that make up the foundation of The Old Mint. This granite came from the Lake Tahoe area, and helped the building survive the 1906 earthquake because of blocks reside on a bed sand, creating a floating foundation. These blocks led to the building acquiring the nickname "The Granite Lady."
Controls for the gas-powered lighting system, which called for one person to turn the wheel and another person to walk around the entire building, lighting each lamp.