Cat Address Stamp - Block/Box Cat Stamp - Custom Cat Address Stamp Cat Address Stamp - Block/Box Cat Stamp - Custom Cat Address Stamp To customize, please click on the 'Customize Now' button on the right. Custom Return Address Stamp is self inking. Impression can last for up to one thousand impressions before being re-inked. Custom Address Stamp impression is approximately 1.65" x 1.65". All stamps are made to order. Most orders ship within 24 business hours.