Home » Other » What does a CPU (ACH) Write-In Stamp Order Form Look Like? What does a CPU (ACH) Write-In Stamp Order Form Look Like? admin 07/10/2017 Other No Comments PS Form 5555-ACH is used as CPU (ACH) Write-In Stamp Order form that looks like this: Tweet Pin It Related Posts What if No Return Address is Available on Undelivered Mail? How to Refuse any Shipment, Package or Mail USPS Restricted Delivery, Cost, and Form Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Comment Notify me of follow-up comments by email. Notify me of new posts by email.