This is an RCA 135871 Vertical Mag module MAG001A, and an RCA148672 Cylinder.
This circuit board module appears to be for a television. On the module are the numbers 1407878-02 MAG-001A, and 1435904-1. The cylinder box reads 148672, and there is a second number 408381. Cylinder VENS0011.
The module measures 3" x 2.5", and the cylinder measures 2.25" in diameter.
This module is in good pre-owned condition in the original open box. It has not been tested.