Just an FYI for those who don't have the Burrluck book (you should get it, it's really good) here's the full paragraph...
53/10 Treble & Bass
This third full-size humbucker in the Vintage series initially appeared as part of a limited run in the summer of 2010, with scorched nickel covers. "It sounds similar to the original 57/08 but with a 'sweeter' top end. It's coil wire is made on the same machine that supplied legendary guitar makers in the 50's and is the warmest sounding of the vintage-themed bunch." Smith said the old machine was cranking out wire. "We've got three types from it - one for each of these ["vintage" series] pickups." Wire specifications for the 53/10 were different than the others, made using a special process reserved for "a single coil bridge pickup circa 1953"
I have them in my SC58 and really like them. To my ears they do have some single coil tone to them. I guess that's by design, but they aren't very high output and don't push my amp very hard which might add to that. Of the 'vintage' series, the 53's have the lowest output, which can be a good thing or a bad thing depending on what you are going for.