Corrected entry: The postcard that Ennis initially receives from Jack is dated September 1967. Not only does the date stamp not show the day the card was mailed, just the year, but also there is no ZIP code on the address. The USPS began requiring ZIP codes on July 1, 1963, and this post card - mailed more than three years later - never would have been delivered without a ZIP code.
johnrosa
3rd Feb 2008
Correction: The US Postal Service created the zip code service back in 1963, but has NEVER required it to be used. You can mail a postcard even today and, without zip, it will get there if the rest of the address is genuine. It just might take a bit longer.
johnrosa