Rodenstock Omegar F=50mm Enlarging Lens 1:4,5

Description

enlarging lens. I don't know much about lenses, so I welcome questions on this lot.
IT CAME IN THIS BOX AND I HAVE NO IDEA IF ANYTHING IS MISSING!
COMES WITH BOX, INSTRUCTION PAGE, CAP AND LENS
LENS LOOKS VERY CLEAN. I THINK THIS IS FOR AN VINTAGE ENLARGER MACHINE.
ESTATE SALE FIND!!!!!!!!!!