I found the stamp above Perforation 13 with a sideways K watermark similar to picture below I can't find any listing for it Sorry I have no way to upload a picture of the watermark,
The 1864-70 issue has the same watermark and FACIT notes the sheet margins for that issue have watermarks of a crown in the upper corners, posthorn in the lower corners and KGL. POST-FRMK on each side.
on perf 13, you can find stampsheets so poorly placed in the printing press that 1 vertical row will only have "sheet edge watermarks" as shown... it's very normal to have a stamp with part of the letters and half a crown. it's rarer to have one with nothing but letters. and even rarer still.. to have a stamp without watermark at all... as this can only happen in position 1 or 91.
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