This rarely found cartridge replacement seems to be original hollow boron. It is used but unknown running hours. Im not sure of status of damping but I have tried it and it will hold its recomended tracking force of 1.25 grams with no problem. Boron needle seem a little bit skewed(see pictures) It could be that suspension is repaired as unit is not collapsed.This a old usable,a full working warranty could not be given. Hollow boron is visible with no sleeves so it should be the original . Take a look at the picuteres,this is what you get!  As this unit is fragile and close to 50 years old there will be no returns on this.