Inrad 705-C 500hz CW plug in filter (455Khz center frequency, 6db/-60db)  in Excellent shape and working as it should. . This is a Collins mechanical filter 526-8693-010.   This is a similar filter to  the Yaesu YF-115C or XF-115C.  Works in the FT-1000MP, FT-1000MP Mark V, FT-1000MP Mark V Field in the main or sub receiver! Also works in the Yaesu FT-847, please check your manual to confirm it will work for your radio!  This is a “must have” for the CW user! Buyer pays shipping for a well packed and insured shipment. Buy from me with confidence as I have excellent feedback.