Date Event Location Stamps / Cancellation Slogans Credits / Notes May 29, 1996 Building Bridges of Peace Awards and Breast Cancer Awareness Stamp Unveiiling Walnut Creek Main Post Office Stamp: Breast Cancer Awareness StampSlogan: Building Bridges of Peace Postmaster: Layton HansenSpeakers: USPS Corporate Area Manager: Dan DiMiglio, Karen E. Lile, Peggy MarshburnPerformers: Kendall Ross Bean, Lissa Werson, California … Continue reading Past USPS Building Bridges Postal Cancellations