Generally, R7's and R8's have the same necks, however, my R7 is not quite as thick as my R8. It's really hit and miss, and even then the differences are quite small. It's on an R9 or R0 where you really notice the change.
Yeah, the red staining on the binding is normal. Mine has the same, as do most other cherry backed R8's around that time. Apparently, after a few more years the red stain starts to fade back to creme, as the bleeding ages. Wierd, huh?!
Hey well my les paul has a tiny bit of bleed at the top near the headstock on the binding other then that it seems pretty much no blems or anything. Well I dont know where my COA is right now lol but if I remember correctly it was a stamped serial number and I think the model was written. I have all of the case candy still except for that COA that is somewhere in my guitar room lol. Well maybe your neck was played a lot? My guitars neck finish is fading a bit to orange from wear and use. I dont think that your COA is that odd guys at the gibson factory probabley like ran out of ink or something so they wrote it. Hows the modd in your blues junior? I love mine too im thinking of maybe putting some mercury transformers in it