I have seen all the grading services grade some chopmarked trade dollars as mint state (uncirculated). Without a chopmark, there is ambiguity as to whether the coin was circulated (for a very short time), but appears that it wasn't, so it can be graded mint state. With a chopmark, it is definatively proven that the coin has circulated (afterall, it was circulated in China to get the chop). For the life of me, I cannot understand how any chopmarked trade dollar can get a grade higher than AU-58. Does anyone else follow this logic?