There are also no horizontal tooling marks present on the finish and/or upper neck as would be observable on the finish of mouth-blown bottles.2.The side mold seams on most machine-made bottles tend to be finer (narrower and lower) - though sometimes sharper and/or visually distinct than mouth-blown bottle mold seams although many mouth-blown bottles have very thick and distinct seams due to less precise mold construction or fitting.(Note: the term "parison mold" and "blank mold" are synonymous for the first mold in the two mold machine process.): (see the Note box below point #3 for an exception) run up to the highest point of the finish and often onto the extreme top finish surface (i.e., onto the rim or lip).On many early (very early 1900s into the 1920s) and occasional later (1930s and later) machine-made bottles the vertical body/neck and finish mold seams are discontinuous and offset from each other; click offset seams for a picture of this attribute.These are actually certification stamps that the Japanese Gaming Authority would affix when they were installed in parlors.They have been called expiration tags for decades by hobbyists, so we will retain that somewhat inaccurate nomenclature.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.
Additional complications come from the burning of fossil fuels such as coal and oil, and from the above-ground nuclear tests done in the 1950s and 1960s.
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.
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