There is (was?) an extra-bold weight of Korinna, but this sample looks like it might have degraded through multiple stages of reproduction. Maybe somebody didn't have the original hard copy or file, so they scanned or photocopied a printed page, which made the letters spread a little. If you repeat this process a couple of times (a common practice in the pre-digital age), you get letters in a weight that doesn't match any existing design of the font. The rounded corners are usually a clue that this has happened.