Viking Exhibition New York 1980 Odin's Raven Edge Inscribed

Hello, I'm very new to coin-related things, so pardon me for that first and foremost. I've been thinking of what to do with my deceased father's coin collection for a while now (some might have a fair amount of value, some not much at all, I have no idea!) and thought I would start by asking about this one coin. It seems to be sealed inside this container unopened. I did find a listing for this coin here: N#166917 , which is how I found this website, but there seems to be many variants of the coin when I look at the associated listings, so I'm not sure what sort of price this would go for. If anyone could lead in me in the right direction or enlighten me on what kind of coin this is, it would be much appreciated! Thank you!
 

There are three year lines on the coin page. The difference is the die letters AA, AB or AC, something unique to the Pobjoy mint that made the coin. Here are where they are if you can read them.

As far as value, I don't know but I would assume more than normal in that packaging.  @MMowiec may have a feel for that. Here's NGC valuation for graded coins:

Similar but in better condition sold recently for 52 GBP: www.ebay.co.uk/itm/226879392154

I paid for my piece (I had AC die mark) much less (maybe 10-15 GBP max) few years ago.