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If it is a raw speaker then you have to make an educated guess.
To a great extent, condition, originality, and, especially, model determine price.
If three digits are present, the first digit would refer the units of the year i.e. If four digits are present, the first two digits refer to the year i.e. The last two digits would refer to the week of the year i.e.
("26" would mean the 26th week or approximately June).
The first three numbers will be 220 which denotes the manufacturer as Jensen.
The next number is the year of manufacture and the last two numbers will be the week of manufacture.