Donald, thanks for responding. My safe is just like the one pictured except mine does not have the timer on the inside of the door. The photos are from a website... a small company (1 guy?) in Germany modifies the safes and then re-sells for a high price. I don't know how his works. I dis-assembled the door on mine and can see the computer circuit board and 2 blue wires from the board that power a "pull" solenoid with a spring. If I can find/buy a timer like his then I assume I can install it such that it interrupts the power flow to the solenoid. Maybe there's a better way. Thanks for your assistance.
-Rob p.s. circuit board says "COIN" right where 2 blue solenoid wires connect to it. I can post photos of the "guts" if that helps.