While digging through my storage aera for parts for a winter project. I found what appears to be a small mechanical filter. The only marking on it are 512453. What would be a good way to test it? Not knowing the center frequency or bandwidth. As for equipment, I have a HP 8061A RF / sweep generator, Frequency counter, Oscilloscopes, and a LP technologies, LPT-2250 150KHz - 10000 MHz Spectrum analyzer. Any information would be helpful.