An 1858 Philadelphia directory lists Farrel, Herring & Co at 130 Walnut St, as my plate says, and then a later 1867 directory has them at 629 Chestnut.
The American Mining Gazette and Geological Magazine, Volume 2, Issue 1, 1865 also lists the Chestnut Street address.
Appletons’ Illustrated Railway and Steam Navigation Guide, 1859 has this ad with the Chestnut address:

So I think we can say the safe was likely made prior to 1859.