You have a very nice TL with serial 689. I am not sure about the MOP grips being original, but they are configured correctly for the early TLs (concave knuckles with no medallions). My collection includes TL serial x4 (not a club gun) which has matching checkered walnut grips with the same concave knuckles and no medallions - like the well used but not abused Target TL 942 also shown in this thread.