Largest Coin In The Us?

The double eagle ($20) gold coin is only 34mm diameter, smaller than the smallest silver dollar. The half-union ($50) gold coin would have been bigger, at 50mm diameter. They were not, however, made for circulation.

what about the largest coin in the world(i know this one I just want to see if you huys know it)

That depends on your definition of "coin".

If by "coin" you mean "a round object made specifically for use as money" then the largest coin ever made is a stone disk called a rai, over 3 metres across and weighing four tonnes. Rai stones are a traditional currency on the island of Yap, in the Micronesian Federation.

The largest rais are not physically moved when they "circulate", of course. They leave them standing where they are, and everyone knows that someone else owns this one or that one now. Some of the largest ones lie on the bottom of the ocean, lost in transport to the island, yet they are still considered valid to "circulate".

If you insist on your "coins" being made of metal, then you'll have to settle for something smaller.

besides stone money, I was thinking of the $1000000 gold coin made in the canadian mint

jbuck, you beat me to it haha

It's 1794 Washington Dollar with the diameter of 41mm. (a little bit larger than the ASE)

The so-called Perkins dollar dated 1799 also has the diameter of 41 mm.

Besides the Yapese rai stones, I believe the largest circulating "coins" were the Swedish plate money: huge ingots of copper struck in Sweden in the mid-1600's. They were originally intended to be the backing for Europe's first attempt at introducing paper money, but when the banknotes were generally rejected, the plate money itself circulated. The briefly-issued 10 daler piece (KM# PM5) was a rectangular slab 64cm long, 33cm wide and weighing 9 kilograms.

I believe these plate money are the largest objects you can find in the Krause catalogues.

Back on subject... I am fairly certain that the largest U.S. Coin made was the 1877 Half Union $50. It was originally made of gold (2.5 ounces?), but other trial pieces were made as well, here is a copper example;

HBCC-6137 1877 $50.00 or Half Union. Liberty Head or Coronet. Copper. Judd-1547, Pollock-1720. Rarity-7.
Obverse Design: Head of Liberty to left, coronet in hair reads LIBERTY, 13 stars around, date below, small B, for William Barber, in field above date.
Reverse Design: Very similar to the standard reverse of the regular-issue double eagles of the era, central eagle with outspread wings, rays and halo of 13 stars above eagle, IN GOD WE TRUST within halo of stars, E PLURIBUS UNUM on ribbon that encircles eagle, UNITED STATES OF AMERICA FIFTY DOLLARS around.
Physical Description: Incredible splashes of rich violet, rose, and blue fairly leap from the surfaces of this beautiful pattern.
Provenance: From Stack's sale of the DiBello Collection, May 1970, Lot 510.
Narrative: The Half Union patterns of 1877, the most impressively sized of all United States patterns, were struck in gold and copper, and in two slightly different varieties in each metal. Evidently they were struck by late August 1877, as impressions from the dies were sent to H.R. Linderman on August 30 of that year. The denomination was only considered briefly before being shelved permanently.
Specifications: Weight: 757.0 grains. • Diameter: 51.0 millimeters. • Edge: Reeded.
Harry W. Bass, Jr. Commentary: Inventory number: 14224.

http://www.harrybassfoundation.org/....asp?id=6137