Maybe the mechanical process of sitting the obi in its final position and sealing the product wasn't perfect in some factories, so they glued or sticked obis as a quick and inexpensive fix. I can imagine the obi could have ended up a bit too high or too low. Just a guess.
Have only seen this with very old albums from the late 80s and early 90s.
Also, I understand the term obi works for music albums and games, but doesn't it mean belt? Sounds like it's more accurate for describing paper belts around books, while spinecard would be more accurate for albums and games...? In the game collecting scene, they're never called obis.
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