Custom Return Address Stamp - Custom Stamp with Address Custom Return Address Stamp - Custom Stamp with Address Customization Instructions: Click on 'Customize Now' on the right and follow instructions. Custom Return Address Stamp is self inking. Impresssion can last for up to one thousand impressions before being re-inked. Custom Address Stamp impression is approximately 1" x 2.5". All stamps are made to order. Most orders ship within 24 business hours.