You can tell how much they cared about data quality because they never took the time to look at context-dependent glyph equivalencies. And some context-sensitive algorithms might not make the same mistakes as a naive “guess what characters are here” algorithm that just uses glyph shapes. You run into this a LOT with ALPR systems because some of the presses excluded some characters. O and 0 are the most common character equivalency. But only in certain places.

OCR is actually complicated if you’re trying to rely on the data for something.