Nice gun. I have a Grade 0; the equivalent of a Field grade with the New Twist barrels. Very interesting design. SAC was in business from 1892 to 1905 when it was bought by Ithaca Arms. They made approximately 35k guns during their existance. The DGJ had a series of articles that appeared in every issue of volumes 14 - 16. However, Vol 14; Issues 1 and 2 would appear to be of most interest to you.