Jaxom, take a look at 76L12. I am including a Seigel image of a 76L12 (the only one I could find) along with mine with a few things highlighted for comparison on the Seigel image. Note side ornament K's shape. The similarity of the ink spots under the letters C & T of CENT. The blur of color along the upper right. The shape of the under part of ornament W (upper right) and the locations and sizes of the horizontal lines on the right scroll. What do you think?
What is visible on Neinken's 86L12 and the piece attached to mine are not inconsistent.