Too bad that one got all scratched up Researcher! I really need to get the BOOK. So far what I think I know, only 12 and 16 ga. but several frame sizes. Pattern counts on the lugs. The grade initials show barrel type, engraving level, and if it is an ejector gun. What I haven't figured out is the grading system. Does it go up the alphabet like Fox Grades? And is there a truly light 16 ga. to chase after? Any other tid bits of info, or insights, until I get the book will be appreciated