I’m not quite sure what you are looking for here, so I’ll try to cover all the bases.
With regard to rarity, it is estimated that about 250,000 were made, so unless you have one of the less common variations I would say that they aren’t terribly rare in the grand scheme of things, though they are popular with collectors.
If you wish to learn more about the knife and its history, I would suggest:
Visiting the SAKwiki page:
https://www.sakwiki.com/tiki-index.php?page=MauserAnd or
Reposting (or perhaps one of the mods could move it for you?) on the SAK subforum:
https://forum.multitool.org/index.php?board=13.0If you’re inquiring about value, I don’t feel qualified to give an estimate. However, there are a number listed on ebay, so I would suggest following some and getting an idea of what they are actually being sold for (not necessarily what they are being listed for).
If your goal is to solicit offers from members of this forum, you should put a post in the Multitools for Sale subforum (be sure to read the rules before posting):
https://forum.multitool.org/index.php/board,7.0.htmlHope this helps!