1992
An advert for the 1992 Widescreen Collection on VHS:-
'Star Wars Trilogy The Widescreen Collection 1992 Promo Trailer:-
https://www.youtube.com/watch?v=Riipp7KLfO4 - a 3 minute video at the The1970Ghostrider youtube channel
Some images of the 1992 UK Star Wars Trilogy Special Widescreen Edition Box Set and also the tapes within:-
I own these and they also include this promo for the widescreen VHS releases of Die Hard and Alien - with comparisons to the P&S presentation. Incidentally it also mentions the widescreen Star Wars releases at the end: