Cool little .22 , Oceans64 .
Lots of the Mod. 15's were produced , many/most without individual serial numbers , making research very difficult on a particular weapon .
These were very common .22 rifles , used for varmits , target shooting/training & small game hunting ; many of these were purchased as a boys' first gun .
Sears , 'Monkey'-Wards , J.C. Pennys were among the many vendors of these small-bore rifles .
One in really excellent shape can fetch around $100 , or even a bit more to a specific collector .... those that have become fairly well 'used' (and loose) tend to range as low as $25 .
Around my neck-o'-the-woods used & functional ones go for around $40-$60 .