The upgrade set itself is uncommon. Is there any information on the back of the box? People could get copies of the system disks from any Apple retailer or user group for free at the time. All Apple IIgs machines came with original disks and the manuals packed in after System 4.0 was released.
Apple also released a boxed System Software 5.0 Update set too. System 6.0 was actually a full retail release.
The upgrade set itself is uncommon. Is there any information on the back of the box? People could get copies of the system disks from any Apple retailer or user group for free at the time. All Apple IIgs machines came with original disks and the manuals packed in after System 4.0 was released.
Apple also released a boxed System Software 5.0 Update set too. System 6.0 was actually a full retail release.