Custom Return Address Stamp - Zip Code Swirl Address Stamp Custom Return Address Stamp - Zip Code Swirl Address Stamp Please click on "Customize Now" on the right to customize your return address stamp. Custom Return Address Stamp is self inking. Impresssion can last for up to one thousand impressions before being reinked. Custom Address Stamp impression is approximately 1" x 2.5". Default color is BLACK unless otherwise stated in Customization. All stamps are made to order. Most orders ship within 24 business hours.