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13-Jan-2020 17:32

Determining the exact year of manufacture of a pachinko machine can be a difficult.The first thing to understand is that unlike automobiles in the US, there were no real "model years" for pachinko machines.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.Tree rings can be counted and their radiocarbon content measured.From these records a “calibration curve” can be built (see figure 2, below).This is affected by solar activity and the earth’s magnetic field.Luckily, we can measure these fluctuations in samples that are dated by other methods.

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.

A good number of 1950's and 1960's machines had small triangular stickers that clearly indicated the patent date in western characters such as 1964.

These tags are typically referred to as patent tags, and should not be confused with expiration tags.

A third method would be compare to pictures of pachinkos with known manufacture dates.

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This can sometimes be difficult as so many manufacturers produced so many different models, but sometimes it can get you the information you need.So the challenge is to try to determine the first year of production for a particular machine model. The first method most people use is to examine what are commonly called the expiration tags.



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