Is this a crystal oscillator?
I have recently acquired some of these myself and was searching for info which landed me here. I was able to solve more of this mystery on my own. By orienting the tab on the can to be pin number one following the traditional DIP design.
Using pin 3 as +5V and pin 4 as the ground I was able to obtain a surprising and desirable output. Four outputs exactly. Included is my not so professional schematic . The quiescent current is a low 1.25ma so i am confident that my efforts have amounted to something. With four stable outputs at different frequency's this device truly has much potential on the bench and with a few discreet components one can produce many different wave forms. I am sure this device has more secrets as well. It took some effort but I am glad to help others and myself.