If it dates to 1912- has a 25" barrel, 2&1/2" chambers and a schmidt-load of stampings on the barrel (ejection port side when assembled to the receiver with all the pending patents, and is roll stamped Model 1912 and Not the post-1919 change to Model 12- then you indeed have a first year Model 12 in 20 gauge-Buy surely you already knew this-


"The field is the touchstone of the man"..