A quick follow up - I contacted Kentucky Leather & Hides, where I got the remnant roll and Penny Wayne said that it's 5/6 chrome. I sent her a sample to see if she can match it. KC at Traditions guesses it's alum Indian tan based on the yellow center. I have some coming today so I'll be able to tell if it's a match. This bag has been very durable and has survived hiking in the mountains, falling while hiking in the mountains, and a torrential rainfall. It keeps on keeping on.