Limited-run boots made on the 602M last. This last is primarily used for Chelsea and moc toe boots in order to support the pattern for them. However, we will be incorporating this last into select Allen production boots as well as one-time runs. The main difference between this last and the 602 is that the 602M has a touch more depth in the toebox and width in the pinky toe area. For more information regarding fit, please see the FAQ section or the drop-down for sizing in the product page once selected.