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Japanese coins are dated by ruling emperor (year of accession) plus the regnal year.
Prior to 1948 regnal numbers are read from right to left.
The date on the sticker is typically one year later than the date of manufacture, because that was the period when the majority of a particular model was sold and certified.
Many pachinkos have lost the tags, and some types do not display a date.
These tags are typically referred to as patent tags, and should not be confused with expiration tags.
These antique pachinko machines would normally have an expiration tag as well. In this case, 1925 49 = 1974, so the tag indicates 1974.
Patent 1963 Later rectangular and circular tags show the year the machine was certified by using the Shōwa year. That means the machine was likely manufactured in 1973 because 1974 is when it was to be removed from the parlor.
Collectors are not generally concerned with the particular year a machine was made, but rather tend to consider all of the same model as being from the first year of production.
Manufacturers might introduce several different models in a single year, with only one of them continuing to be produced in the next.