Icom FL-32A 500Hz CW Filter Option for Icom HF Rigs.
9.0106MHz IF.  500Hz -6dB bandwidth.

Fits rigs such as Icom IC R-71A R7000 IC-751A

IC-725, 735,  etc.  Please check your manual for compatibility.

Tested, and guaranteed working.  Includes instruction sheet.  Excellent condition.