Original gold guilder of the Polish king Władysław Jagiellończyk, Warneńczyk.
Władysław III Jagiellończyk (Warneńczyk, born in 1424 in Krakow) was King of Poland, King of Hungary and Supreme Prince of Lithuania : Encyclopaedia: https://en.wikipedia.org/wiki/Władysław_III_of_Poland
Władysław III Jagielończyk was the first-born son of the famous king of Poland, Władysław II Jagiełło, who defeated the Teutonic Order in 1410.
This is the first gold coin with the coat of arms of the Republic of Poland, i.e. the Polish Eagle. It is considered to be a Polish-Hungarian coin.
The NGC gave the coin the highest and the only grade in the world, i.e. MS 63.
NGC number: 3312728-001
Verify NGC Certification: https://www.ngccoin.com/certlookup/3312728-001/63/
A coin in such a state of preservation is extremely rare.
Additionally, this particular gold coin relates to as many as 3 countries: Poland, Hungary and Lithuania.
Moreover, according to a Portuguese historian, King Władysław III of Poland was the father of the famous sailor and discoverer of America - Christopher Columbus : https://www.newsweek.pl/wiedza/kolumb-mogl-byc-polakiem/cfxlz57
A similar coin with a lower grade of MS 62 was auctioned 10 years ago, in 2010, for $4887.50. That was 10 years ago and the grade was lower : https://coins.ha.com/itm/hungary/wladislaw-i-of-jagello-gold-gulden-nd-1440-1444-hg-/a/3008-22138.s?ic3=ViewItem-Auction-Archive-ThisAuction-120115