Just had this 7 day set land today. Very minor rust on the tangs, otherwise in great shape. They all have yet to ever be honed.
KOBAR was a brand belonging to Friedrich Emde (as was the trademark Kiebitz). The company changed name to Gebrüder Emde and later EMDE. They produced razors between 1902 and 1939.
Try starting with the razor flat against your skin, then increase the angle (with no pressure!) until the razor starts catching the lather. That’s the angle you want to keep. Start on the cheeks - where everything is flat, and only go to more demanding areas once you are comfortable on the cheeks with the grain.