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The level is factory made. It is almost impossible for a woodworker to make a perfectly square piece of wood.(a level) I don't think I could do it and I have years of experience.
Example: when laying sewer line from the house to the main line one must maintain a 2 percent grade or more. (code). Using the level atop the pipe shows the grade as you proceed.
Let me clarify...I believe the dial to be written by hand, for the reasons I stated above.
I see what you mean and I agree that does look handmade. On the factory made dial is an etched line at 12:00 and 6:00, also barely visible at 9 and 3. If you take a ruler and line them up the handmade dial is visibly "off" by 3-5 degrees. There is also a crack in the glass or plastic from being damaged, probably dropped. At that point I'm guessing the hand printed shifted or dropped away from the factory marks making your level useless, but still an old conversation piece.