On current models it is a black dot in the clip that distinguishes the marker within the LeGrand line from other writing instruments. The dot is only glued in and can fall out with frequent use. Older markers (e.g. with sticker 'W. Germany') did not yet have this dot, so its absence on old pieces is no authenticity problem. On overseas purchases shipping costs, customs and PayPal fees should additionally be included in the calculation to assess bargains realistically.