Curiosity got the best of me... and well, I've never owned an original US Doubler... so I made good and got one from B&C.
The RAM pack is the expected black ICD logo'd epoxy brick, and the ROM is just a 2732 EPROM like the homebrews. Is the ROM, it's labelling, and the anti-static foam pretty much how the originals always were, or has B&C potentially created their own EPROMs to match up with an excess of original RAM packs?
I also dumped the ROM and can confirm its the expected CRC32 605B7153
I'm guessing it's a repro. It also looks like the manual is a photocopy of the original.