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Your tin may have graphics or text that can be attributed to a particular time period.
If you're collecting local brand/company tins you probably have access to a library or historical society that have these books.A copyright date may appear but the product may not have been actually marketed until the following year or later.Find out more about Copyright and Patent information as you read the listing below.As time went on, the tin manufacturer realized that all that metal wasn't always needed to protect the product. Note: Certain size tins were in use during particular time periods. In some cases this can identify its age, but be cautious.They also found out that you didn't have to apply as thick a coating of paint, ink, or whatever they used to maintain a somewhat durable finish. Copyright (and Patent dates) can be misleading, appearing on the company's products for many years.
This can only be determined if you're willing to remove the label from the tin.