Oh great, that gives me already some hints
Lewguitar: no, they (it's actually a pair of PAFs, the other one is reverse Zebra and has a sticker "59B" on it) newer had a cover on them
Freefrog: hmmm, would be great if you could compare this one with yours
Ulrich

That's great, because they really sound so sweet, great attack and smooth mids
Because this one tendsto feed back in high gain distortion, i swapped it with a newer SD PAF, a 59N as well, but with SD stamping on the bottom. They have different DCR too, the old here has 7.8 kOhms, the newer one 7.6 kOhms.
maybe i should wax it, but i haven't done this before, i'm not sure ....
Where the covers removed? Seems so. It doesn't have the black like cloth tape around it. I'll go ahead and say it's a 59 as well.
Below is a (sadly bad) pic showing one of the sets that I've mentioned (with the oval "Seymourized" sticker but also the small paper sticker saying "59B" in red letters). The feets of the baseplates have been trimmed, BTW: they were initially square shaped.
In this case, the neck measures 7.8k and the bridge reads 8.6k, if memory serves me.
View attachment 87219