Supex SDX 1000 MC Cartridge

I found this cartridge in a box the other day. I used to work in the business a long time ago. Its got the supex jewel case,protector, and the leads. I never used it and I remember it never was demo'd much in the shop..anyone know what this is worth?..All the lettering is clean on it..I think it was on a Linn for a bit. Thanks