Here is a neat little piece of Apple II history: Mystery House from On-Line Systems, later Sierra On-Line.  It was the first computer game with graphics.

I'm guessing that this is the first edition.  You can see that it is rather charmingly overlabeled on a consumer 3M floppy disk, probably hand-assembled by the Williamses I would guess.  I don't think I touched it for 40 years before I unearthed it from a box of old software this week.

Amazingly, the disc still reads for me, although it does chafe alarmingly, probably because it is slightly bent.  It will probably return to form weighted down with a book for a little while.

On Mar-26-24 at 18:23:00 PDT, seller added the following information:

This is a 13 sector disk.

On Mar-27-24 at 10:01:28 PDT, seller added the following information:

Several people have asked for more information about much the disk is bent.  I have added a picture that shows the area with the maximum deflection, which is a little bit less than 1/8 of an inch.  It was greater when I first took the disk out of storage.  Because of that, I only ran the disk long enough to determine if it was 13 or 16 sectors.  With a less precious disk, I would not hesitate to run it with this small amount of warping, but with a little more time sandwiched between a pair of heavy books, I think that it will flatten out completely.  The disk spins freely in the jacket and shows no signs of damage.

On Mar-27-24 at 10:31:26 PDT, seller added the following information:

Man, if I had any idea what kind of price this might go for, I would have tried to clean it up a little more, but I guess you have seen it now.

On Mar-27-24 at 22:43:51 PDT, seller added the following information:

There have been quite a few questions about the history of this item.  It was a birthday present and would have been bought in the Portland, OR area before August of 1980.  I have owned it ever since.  I'm pretty sure that the plastic bag is what it originally came in.  There is a partial price tag on the bag, but there is not enough of it left to read.  I can't be completely sure, but the last time this disk was run before I checked it this week was very likely 1981.  There have also been several questions about cards and labels and when disks of 13 vs 16 sectors were offered, but I just don't know the answers to those.  Seek out a collector for that kind of information.  I Googled this before listing it and had no idea that it would command such interest based upon what I read, so I am not the expert that you need.

On Mar-28-24 at 13:12:51 PDT, seller added the following information:

More questions about the condition of the disk... I do not have an Apple II set up to read 13 sector disks.  I do have a floppy drive that runs on an FC5025 controller connected to my PC.  I ran the disk in that drive long enough to confirm that it reads as a 13 sector disk, not as a 16 sector disk.  That is all the work I have done with the disk because I don't want to damage it.  Ideally, someone would image this disk with hardware that is able to make a real image of the full magnetic structure, but I don't have the equipment to do that.  I don't guarantee anything about the disk other than that it spins and it is a 13 sector disk, because I simply don't have any more information than that.  I really thought that somebody would hand me maybe a couple hundred bucks and I would send them a bit of nostalgia that might or might not work.  If I had realized that this would amount to thousands of dollars and news articles and questions from game writers, I would have done a lot more work before I listed it, but here we are.  I have given you the best information that I can provide.