These are made by the people who made these for JL back in the day. The only thing it's missing is the magnet boot and sticker. There is an "18W6" stamped on the back plate of the motor. The motors on these 18's are bigger than the ones they used on the 10-15" models, if I remember correctly.
From what I understand, these are not "old stock" woofers that have been sitting in their factory boxes for all these years...they would have been cleared out by now if that were the case. Credence probably had a bunch of 18W6 motors and baskets for whatever reason, and used new soft parts to complete the build.