I pulled a copy of the card a few days ago but hadn't noticed the error until seeing Dave's post. My kids thought it was pretty cool.
Japanese collectors have taken note (Calbee itself put an announcement on its website about the error, promising to replace them with corrected versions). Yahoo Auctions is now full of Hiromi Ito Error cards with asking prices much much higher than a 2024 Calbee regular card of a pitcher with a 27-28 career record would normally command.
These aren't just sitting there either, a lot of them have bids. This one for example is up to 1900 Yen (about 13$ US) with 63 watchers.
This reminds me a lot of the late 80s/early 90s error mania in the US, when 1989 Fleer Billy Ripkens or 1990 Upper Deck Ben McDonalds were the hottest cards on the planet for a brief period.
The problem for anyone paying real money for an Ito error card is that it doesn't seem like its even remotely rare - there are dozens of copies of it available on Yahoo Auctions right now. According to Calbee they will start distributing corrected versions of the card from May, so it stands to reason that all of the cards they've issued in April will be the error card, likely a significant number of total production. It'll probably end up being harder to find than your average Calbee card, but I don't see it being a major valuable card in the future.
Nonetheless, its kind of cool to see some buzz around a card. Brings me back 35 years......