Your Stevens Pocket Rifle was listed in the 1897 Sear Roebuck Catalogue.
The 12" barrel version could be had for $8.95
The 15" barrel version could be had for $10.33
To put the relative cost in perspective a Marlin 1894 Carbine in .44-40 with 20" bbl went for $10.64
My particular model is the earliest one. It's from about 1880 or so. From what I understand Stevens made about 4 models of these pocket rifles, the last one being made about 1910.