COLLINS TRANSPONDERS TDR-90 P/N 622-1270-001  , I HAVE ACQUIRED A LARGE LOT OF AVIONICS COMPONENTS AND INSTRUMENTS  .  UNITS ARE VERY CLEAN AND COMPLETE ,HOWEVER I HAVE TO OFFER THEM  AS IN UNKNOWN WORKING CONDITION , 

I DO PACK VERY WELL , 

HAVE A LOOK AT MY OTHER ITEMS , YOU NEVER KNOW .