- Scott Catalog # : 4446 - 4449 / FDCO Exclusive First Day Covers.
- Set Includes : 4446 Roy Rogers / 4447 Tom Mix / 4448 William S. Hart and 4449 Gene Autry.
- The Collectible First-Day Digital Color Postmark is an official digital postmark bearing the first-day-of-issuance-date containing an image that relates to the stamp design with the words "FIRST DAY OF ISSUE."
- The cachet (image) was made on a computer and printed on high-quality envelope.
- ARE IN MINT, UNADDRESSED CONDITION.