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Precise dating is difficult; estimating
a range of years is more likely.
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Examples date back to late 19th
century.
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Vintage is generally considered to be
pre-1969.
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Obviously easy to determine age if year
is included in design.
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Team player names and events
represented can aid in dating.
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Certain
designs, images and style characteristics represent age.
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Manufacturer
logo can provide hints to a timeframe.
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The subject matter itself can define a
year or timeframe.
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The team or city can define a given
year or range of years.
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Actual
material and printing styles can provide clues.
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Paint colors like day-glow or
fluorescent can reveal a period.
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Photographs
of events or people holding pennants help to pinpoint age.