I just tested simple 2 series 455kHz ceramic resonators filter ( as normally used crystals), these marked 455E.
Bandpass CF: 435.45kHz, Bandwidth 2kHz
Sweep 100kHz, center 455
ps: added sweep of LT455HW ceramic filter, measured BW is 10.4kHz, 2-series res.filter 5 times narrower and much cheaper, I'll use one on DIY spectrum analyzer to see FM broadcast 19kHz pilot