You might want to visit the LC Smith Collectors website, they have FAQ and other very imformative sites that can give you details. Before 1913, the OO grade was LC Smith's "economy or field grade"- Armor steel, no engraving, solid walnut, 18 LPI flat top checkering, most were made, as yours is shown, with double triggers and manual extractors. You could, however, get both the Hunter One Trigger and selective ejectors on the OO Grade, at extra cost.
Around 1912, the Hunter brothers (five) decided to revise the Smith guns, and also change the numerical grading to a named grade--They also revised the shape of the lock plates a bit, so that a lock plate from a 1909 mfg. 12 gauge OO grade may not fit (as a replacement perhaps) a 1914 Field grade-
In the lower grades- pre 1913-- OO, O, 1, 2, 3, Pigeon, 4-- etc and if an E suffix, then an ejector gun. In the post 1913 "revamping" Field, Ideal, Trap, Specialty, Eagle--and up
Your gun is on a std. or sometimes called "R" frame, if it had two lower forward machine screws on the lock plates and a slightly smaller barrel lug, it would be on a FW (featherweight frame) or FWE if an ejector gun.
I have a 12 OO grade made in 1911- 28" Armor steel, DT, Extractors, R frame, choked M&F-- I also have a 1924 Specialty Grade, 28" Crown steel, DT, Ejectors, on the R frame, also choked M&F-- Both fine Smiths were made from the same grade of steel, and both work like a fine watch- The Specialty has finer grained wood, finer cut checkering, engraving, etc- but either one will drop a Rooster pheasant or a barnyard pigeon dead as sin if I do my part-
You might also like to know that 80% of the entire production of Hunter Arms, Fulton NY- regardless of gauge, was the basic field grade with DT and extractors-your grandson can enjoy this fine Smith some day, the Good Lord willin' and the creek not a risin'--
You might also want to get copies of both the Lt. Col. Wm. Brophy book, and more recently, the John Houchins' book on the "Elsies"-- a wealth of information on America's finest true sidelock side-by-side double (and, in case you hadn't yet guessed it, also my favorite as well)!!
