977908 (GOST 27365-87)
The bearing consists of one outer ring and rolling elements (tapered rollers) which are connected by a cage.
Tapered roller bearings are designed to accomodate combined loads (radial and axial). They have a split construction: the inner ring with the rollers and separator create the unit which can be mounted separately from the outer ring.
This is a special soviet aoutomotive tapered roller bearing without inner ring.