No code, it'll be by year (moto bags were chevre until 08, which was a transition year where you'll see both chevre and agneau) or sometimes by style (i.e. the metallic edge bags are chevre, the Papier range is calfskin, and the classic hardware bags are agneau).Question for the experts...How can you tell what kind of leather a bag is....is there a code for chevre etc....or is it just that they didnt make them out of chevre after a certain year?