So I just did comparisons on the other Nitro albums. Based on the etchings, Answer That, VPoY, and Shut Your Mouth had new plates made for the Nitro box set. Black Sails and AoD used the same ones as the original LPs.
What's on that Black Sails test press you have?
OASIS DISC MASTERING 15824-1 A [illegible signature] L-51556
OASIS DISC MASTERING 15824-1A (or maybe B? Would make more sense but it's hard to tell) [illegible signature] L-51556-X
Side B (Port Side, heh) is crammed in really small, as the lock groove and Midnight Sun take up most of the space where this stuff would usually appear.
Despite what discogs currently shows, based on what I remember, I'm pretty sure none of these Nitro color variants appeared until the mid 2000s. The fact that there are at least two Nitro versions (that is, physical differences in the stampers that were used to duplicate the records, even if they're meant to be not easy to distinguish) of the first three albums makes me wonder how many different times the various incarnations of Nitro have cut new lacquers and plates for these albums.
Hopefully this is all enhancing the thread instead of hijacking it. Haha.