There are no LC Smith serial numbers beginning with an "O" prefix; so the first thing you would require in order to determine a production era and begin an accurate grade determination is a complete serial number. As to the word "TRAP", yes Hunter cataloged a "Trap Grade" beginning in 1913; however, many of the early Syracuse, NY and early Fulton, NY Smith guns are fitted with butt plates marked "Trap" or "Trap Grade" and are misidentified as an LC Smith "Trap Gun" by sellers. These Smith guns differ greatly from the later post-13 Trap Grades; so a complete serial number will ID the correct production period. And one other thing to look for that will ID a post-13 Trap Grade Smith gun would be to check the top of the barrel tubes; post-13 guns will be roll-stamped "Trap Grade" atop the right barrel.
