Quite a nugget. There are certain pieces that stand out in any instance and can accurately be deemed world-class. This IS one such example that represents a finite material to begin with - Gold Nuggets. This Australian treasure has quite a background story, as well, as it was discovered by the wife of a couple with a metal detector in 1979 in the Kalgoorlie Goldfields. Moreover, the exceptional find was deemed to have been the largest Gold Nugget from the famous area in nearly 50 years, since the "Golden Eagle" Nugget was found in 1931. https://fineart.ha.com/itm/minerals...8208-72132.s?ic4=GalleryView-Thumbnail-071515
Not sure what the buyers commission is, but with an estimate(?) of $500k for 145oz it would have to be a good price for one lucky collector.
