I’ll leave it to others with a more esoteric interest in collecting in the
RPG space to advise on possible value.
My observations would be that it is an obscurity, one may consider it rare, but it is a digest one off game with little history of note, and little future playability. No more rare than say a copy of a fanzine in the same time frame (let’s pick Beholder #26 as an example) of which probably less than a dozen still exist, which no doubt probably reside in at least one collection on this forum, but which do appeal to the mass market when it comes to saleability.
There are those who will buy because it is D&D.
Those who will buy because it is part of a set.
Those who buy because they want to possess rare knowledge unavailable to others.
Those who perceive a future increase in value.
On the whole I’ve found most people establish their assessments of value based on how much they desire something, and on how much they perceive others to value that thing. This is done usually through forums talking and researching things, and the watching of the flow of products through eBay etc.
With this it’s a complete turkey shoot. Unknown author. Unknown product. Unknown quality. Unknown value to others in the marketplace. I’d be surprised if you got more than $50 for it. I’d consider bidding $25 on it myself on account of having to ship it to Europe if you’re in the US. It has no real playability appeal for me, but it would make a quirky PDF to add to a collection of the weird and esoteric.
The link makes good reading.
Post a link if you stick it on eBay.
If you get private offers over $100 from anyone on the forum with a few thousand posts to their name, take one of them. They are generous more often than not, and you won’t have to pay fees to eBay.
This week I've been mostly eating . . . The white ones with the little red flecks in them.