That little hole in the handle and the "scoop and ridge" underneath show that this is a *BSR skillet with heat ring.
*Birmingham Stove and Range co. Made between 1949 and 1968. The small size of the pour spouts show this was the "Century" series made in the 1950s. In 1960 the Made in USA across the "top" opposite the handle, was added.
This size is fairly common and not expensive, sell in the low 20s unless in near pristine condition.
If you come across a #8 or a #3 with the same characteristics, they are worth $150.00 and $75.00.