This Collins 51S-1 receiver AM 6KC Filter, P/N 526-9378-000 / F500Y-60 is in excellent condition and was removed from a working radio.NOTE: The fiter in the picture may not be the one I will send but it will be in similar condition.I can not test it but will extend a satisfaction money back guarantee including the shipping cost if you are not happy with it. I will include the service bulletin which describes replacing T14 and T15 with this 6KC Mechanical Filter.