I have a stamp with a sideways watermark. Based solely on the perf I identified it as Scott 86a. According to the website below this particular stamp can be difficult to accurately identify. I was hoping to find mention of watermark orientation but couldn't find it in Scott or the very informative website below. Anyone familiar with this particular issue who could tell me if this watermark orientation is common for this issue? Appreciate any assistance offered.
Unfortunately the stamp has a defect obvious to all.