In the article “Stamp Announcement 12-46: Four Flags” in Postal Bulletin 22343 (8-9-12, pages 45–46), the issue city of the stamp is now incorrect. The updated information is given here in bold.
The issue city will now be Humble, TX, instead of Washington, DC, and the first-day-of-issue postmark address should be as follows:
Four Flags ATM Booklet of 18 StampsPostmaster1202 E. First St.Humble, TX 77338-9998
— Stamp Services, Marketing and Sales, 9-6-12