Both kinda… I think that it’s a genuine 1st ed since Wizards was the one printing pokemon at the time, but it was distributed as a promo. Also, I could be wrong but I don’t think that there were any unlimited versions stamped in English. I found a copy of an Italian unlimited stamped, but I haven’t seen anything besides English in 1st ed. I think @quuador could help
The W-stamped Jungle Pikachu is indeed only available as 1st edition English and unlimited edition Italian versions. So no unlimited edition English; 1st edition Italian; nor any other language Jungle Pikachu is out there with the W-stamp a.f.a.i.k.