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Many of the postcards we have at the Archives were printed by Curt Teich & Co.
It is easier to give Curt Teich postcards an approximate date because the postcards’ print numbers correspond to production years.
For these sites, we show estimated metrics based on traffic patterns across the web as a whole.
“Guide to Dating Curt Teich Postcards,” (PDF) Curt Teich Archives, Lake County Forest Preserves.
The website owner has installed an Alexa Certify Code on the pages of their site and chosen to show the metrics publicly.