A photo of a counterfeit G1 Prowl recently showed up on a Japanese auction site.  This is from Zhong Jin, the same counterfeiter that also made Wheeljack and Mirage.  Obvious differences include no pre-applied "POLICE" sticker on the door, brighter grid lines, and the sun burst being too bright, making the grid lines near the artwork hard to see.  A more complete ID guide for this counterfeit can be viewed here.

Vintage collectors, beware!!!