One of the four-digit numbers, probably the first one in the second row, goes ABCD, where AB = style, C = leather, and D = last. Boots can be on the 1 last so I guess that. There's more than ten leather options so the same number for C can mean different things on different models. If you look at the website, you can see the unique 4-digit codes for each style/leather at the start of the line of text in the drop-down menu for "color." COMB means combination last, which is typical for AE and Alden ... narrrower width for heel than for ball. This is why Alden lists their widths as B/D, C/E, and a lot of English shoes seem wide at the heel for people who normally wear American shoes. The rest of the numbers, I don't know. You can email AE with that line of stuff and see what they can tell you about the boot.