The cars were made by Roco in Austria for Atlas in the 1970s, when Atlas got into the business of selling locomotives and freight cars in N. HO and O scale. Prior to that, Atlas was all about tracks and buildings.
The coupler looks good, but does not have an operating knuckle, so it doesn’t always work so smoothly with traditional O gauge knuckle couplers, especially if weight isn’t added to those very lightweight cars.