Piezoelectric RF SAW Band Pass filter, type FAR-F5CE-942M50-K288. This is an E-GSM type with center frequency of 942.5 and a bandwidth of 35 MHz. So range is 925-960MHz, that’s including the E-GSM. This proves the M3x88 is E-GSM compatible.
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Siemens+Matsushita (=) IF SAW filter, center frequency 225MHz.