This Colt ‘Rampant Colt’ roll die sold on Ebay on 13 May 2020 for $535.00. The photos below are from the auction listing.
Rampant Colt Roll Die
The Colt AR-15 Resource
"A site dedicated to the history of the Colt AR-15 rifles, carbines and associated items"
The Colt AR-15 Resource 