Those guns are a bit of a nightmare for collectors, as there were different models and variations within the models, as well as options in sights and barrel length.
I think your # 1, Picture 2989, serial 39202 is a Stevens Offhand Target, No.35. They made about 50,000, 1907-1916
I think your # 2, Picture 3011, serial 1662 is a Stevens Diamond No. 43, First Issue; some 25,000 were made 1886-1896.
And I think your # 3, Picture 3005, serial 50159 is a later No. 35 with out the butt cap.