I just typed up some information on the 57/08 pickups that I have in my guitars. I have quite a few so I pulled this information together for a tread on another forum. I figured it could be useful in this thread.
I have 8 sets of 57/08 pickups. They range in age from 2009 to 2017, and one that I bought late last year, which I just remembered having. So I have 8 sets and an additional treble pickup. They definitely changed how hot they were winding them for a while. They also changed how they are marking them.
My high and low readings are these.
High
Treble 9.27k
Bass 8.58k
Low
Treble 8.54k
Bass 7.80k
My oldest set is the set in my Ted McCarty single cut. those have no markings on the covers at all. The covers are lightly brushed.
They started engraving 57/08 on the cover and were still brushing the cover.
They then added TM to the 57/08 and still had brushed covers. I have one set that is from back in that 2009 era that have shiny covers and gold pole screws. These were out of a special run guitar back then. Those have 57/08 TM on the covers.
The set in my 2015 P22 Trem are uncovered squabbins. These are hotter wound.
The set I put in my 594 have shiny covers with 57/08 TM on the covers but these have shiny covers, as to all of the current ones sold through the PRS accessories store.
The newest one I have was bought in the fall of last year. I had planned on swapping out the bridge pickup in my Studio. However, after playing with the setup for a few days I got everything adjusted to where I like it. This new pickup has a shiny cover with 57/08 TM on it and it measures at 8.84k. They have gone back to the lower output that they used to wind them at.