Horse Address Stamp - Mustang Square Custom Horse Stamp - Personalized Horse Stamp Please click on "Customize Now" on the right to customize your return address stamp. Horse Address Stamp - Mustang Square Custom Horse Stamp - Personalized Horse 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 1.65" x 1.65". Default color is BLACK unless otherwise stated in Customization. All stamps are made to order. Most orders ship within 24 business hours.