The AM457B1253 from Anatech Electronics is a Band Pass Filter with Frequency 421.675 to 493.48 MHz, Bandwidth 71.805 MHz, Center Frequency 457.5775 MHz, Insertion Loss 1.5 dB, Rejection 30 to 30 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for AM457B1253 can be seen below.