I think there are tons of Chinese-made cues being sold on ebay that are falsely advertised as being Adam cues made in Japan.
If you see one with thin silver rings in the joint collars, it is most likely not one of the Japanese cues...they have thick silver rings.
How thick is thick? I just looked at the GB-2 I've had since 2002 (when they were definitely Japanese made) and the rings above and below the joint are maybe 1/16th to an 1/8th of an inch, with thicker black rings on each side.