Even Schrade employees had a hard time keeping up with the numbers. According to one, many patterns were prepped as anniversary issues, as the XT2ANN photo and the recent sale of a 165 anniversary issue show. Even 897UH's were etched and shielded if I remember correctly. Ebay sellers sometimes either make up numbers, or use whatever numbers they find on bags as gospel. I guess the eventual uncovering of the factory records is the only way a lot of this will be finally ironed out. And maybe not even then.