I have for sale an Icom FL100 500hz CW filter. Works fine, just decided to use a FL101 in my 706MKII instead. This model works in the 706/725/726/728/729/736/737/738/746/756/761/765/775/781 series of radios. It will not work in the 703/707/718 models. I am asking $75 shipped for it and can take paypal/check/MO. 73 John AF5CC