Your stamps have an X watermark.
In the Michel catalog these X or Y watermarks are related to the elongation of the paper fibers. (see the vertical or horizontal white lines)
To quickly sort stamps by watermark, I observe the way the paper bends when I soak it for cleaning.
Stamps with an X watermark bend vertically.
Those with a Y watermark (more valuable) bend horizontally.
I use this method for all German stamps from this period and then I also check them visually.
Posted 04/04/2025 2:00 pm
