The easiest way to tell if it is an e3 V1 or V2 is by the double kit attachment on the back of the stroller. If there are two short pegs or post (male connectors - like on sport, dash and classic) it is a V2. If there are two female connectors (hollow steel tubes) it is a V1.
On e3v2 buggies, 'e3' is embroidered on the buggy's seat.
On e3v1 buggies, the word 'explorer' is sewn on the buggy's seat.