A very nice cover! Having a Feb 14 date, does it have the valentine enclosed?
The standard reference for stampless covers is the "American Stampless Cover Catalog", current electronic version online at:https://www.uspcs.org/resource-cent.../your-input/
The link to the CT listings will have your postmark 14 lines up from the bottom of page 5, with a value of $5. As you can see there, the listings don't have a "catalog number" to associate with each postmark.