as a former new car dealer (and a dealer license plate frame collector)....
If you ever come across a dealer license plate frame that has an inch and a half cut out of the top section, it was from an Ohio dealer. Ohio has had almost this exact law on the books for years, and the plates from at least the mid-1990s until 2001 had the word "OHIO" centered at the top where any frame would cover it.
In 2001-2003 we had a special "bicentennial" frame with "OHIO" on large letters on the left and nothing at the top. The notched frames looked ridiculous on them. Many dealers changed
In 2004 we got a new "normal" plate. Guess where they put "OHIO"! The smart dealers saved their old frames.
Although it's on the books I've never heard of anyone being pulled over for blocking the word "OHIO" on the plate. In fact about 1 in 25 cars here lack the front plate completely. When I moved here I sold my Saturn to the County Sheriff (for his wife to drive) and I asked him about that. In no uncertain words he said what amounted to "
We have better things to do."