I think the Byron is on the 4 last. This is what AE says about the 4 last: "Modeled after the 7 Last, but with a fuller, squared-off toe." AE says the 7 last is best for the average foot. The two pair of AEs that I have on the 4 last are both C width and are snug but comfortable. I usually wear a 7D. In short, I'd say the 4 is very true to size. Now, having had a look at your avatar, I feel the need for a big dish of beef chow mein.
6/2/07 at 10:36pm