Those TOWA 114/1000mm instruments were once popular despite of their lower performance, compared to the "straight" 114/900mm Newtonian TOWA built as well. It was sold by companies like Bresser/BOB, Tasco ("13T"), Eschenbach and Revue which was the German equivalent of the "Prinz" brand of the Foto Quelle mail order company. They had a reflex finder that was in prinicple one of those dreadful 5x24 non-achromats, and as the tube you looked through using the finder was not parallel to the main scope, it was increadibly difficult to find anything. The corrector was in the draw tube, so the effective focal length changed when moving the focal plane. The same design was built as 76/600mm table top telescope (I have one in my collection) and as 152/1300mm instrument which was quite expensive and not very successful. The front plate, while looking like a corrector, was indeed an uncoated flat.