This is a used Promaster 80-205mm zoom lens, serial #875599, that was designed to work with the Olympus family of manual-focus cameras, such as the OM-1, OM-1N, OM-10, etc.
80-205mm lenses are super-handy in that they go from portrait range (80mm) to long telephoto (205mm) for those far-away subjects.
This lens is in 95% new condition with the absolute minimum of handling wear and is sold complete with front cap and rear cap.
This lens is offered for $45.00, including shipping to the CONUS. Paypal, money orders, and personal checks are all fine.
If you have anything to trade, we'll surely consider that, also!