The brass studs on the authentic LV Speedy are convex (curving outwards). The authentic Speedy has a continuous round shape with no flat sides.
The Louis Vuitton heat stamp should be clear, with crisp letters and no signs of sloppy, bleeding or mis-stamped letters. On the authentic Louis Vuitton, the T’s should be nearly touching & always has round and large “O”.
The authentic LV speedy padlock should have on the one side letters 'LV', while on the other side, the inscription 'Louis Vuitton Paris'. The intersecting letters LV must be perfectly stamped. Bottom of the V letter could not touch the L letter.