H on the action water table, 2.40 inch width at breech balls. However, a few legitimate H Grades were made on the standard frame, which is smaller. Engraving pattern similar to early A Grade. The serial number will help. Give us a number and we'll give you some help. Some H Grades have the message "Barrels not guaranteed, see tag." stamped on the barrel flats. Some do not have this message.