Moving this quote from 'name this Gucci'
Yours isn't pigskin (actually 'pigskin' or 'porc' is what it's called in France, more accurately called boarskin in Italy because of the the traditional Florentine/Tuscan material/animal). In the UK it is offered referred to as peccary or tunstall (I think so they don't have to say pig or boar

). Anyway, pigskin/boar would have tiny pore marks all over the skin not smooth like yours.
I'm supposing that this model could have been special ordered in boar in the 1990s though I've yet to see one and it would have been more fashionable for polished calf. The 1950s versions were often made from boar, so perhaps the other one was a much older version, the predecessor to ours. Sometimes these were also with the newly incorporated and now iconic Web-stripe.
Check out this thread, I think we have some 1950s versions :reading: