Ed, I think you'll find that its a bandpass filter centered on 455kHz.
The part about a "crystal socket" is a mystery..... You also need
to know what the loss and bandwidth is before considering it. Also,
does your particular application make accommodation for a filter (loss
compensation, et al). If not, you'll need to do some design work,
albeit simple.

Ed wrote:
Please educate me. I see one of these for sale on ebay that plugs into a
crystal socket. I know that a lot of boatanchor IF's are 455Kc, does this
generate the IF for old receivers, or is it a bandpass filter?