There are 4 pins on it. How would it be hooked up? What sort of voltage?
The bottom left corner is square, the other three corners are rounded(top view).
It's about .5W x 1L x .25H(inches).
It's not a crystal. It's an oscillator. Add ground & Vcc and get 1 MHz out. I don't have it handy, but the pinout is standard. Can't tell if it's TTL or CMOS. M-Tron should know.