I am discussing a possible purchase of a 1980's Sabre bass. The seller claims it is 100% original. I looked at pictures, and to my surprise, the pickups are enclosed, i.e. the pole pieces cannot be seen as with a typical MM pickup. It was my understanding that the normal MM humbuckers were used in Sabres. Am I incorrect? Did they use different pickups in the later models. I have actually seen this before on other Sabres and assumed that replacement PU's were used. Help! Thanks!