The physics
A real Morgan silver dollar weighs 26.73g of 90% silver. The U.S. Mint struck the same composition from 1878 to 1921 — the spec hasn't changed since.
A brass replica from Fujian weighs about 24.5g. A zinc-core fake weighs about 25g. An oversized "novelty" coin can weigh 28g or more.
A $5 scale catches most fakes in under five seconds. The fake market is hoping you don't have a scale.
Three independent signals
One number can be lucky. Three numbers, all consistent with a real Morgan, is hard to fake.
A scale reads to 0.01g. Compare against the published spec, with a small tolerance for honest wear.
Each coin's surface — every nick, every toning pattern, every strike imperfection — is captured as a perceptual hash. Two photos of the same coin in different light still produce nearly the same hash. A different coin produces a different hash.
Real 90% silver Morgans ring in the upper kilohertz range — typically 6,000 to 7,500 Hz — with long sustain. Base-metal fakes ring at lower frequencies and decay faster. Density and elasticity together produce the ring; a fake's metal can't fake both at once.
What "registered" means
Three signals get hashed together into a permanent COIN_ID. Anyone with a scale and a phone can re-weigh the coin and re-photograph it, then check both against that ID. If the new measurements match, it's the same coin.
We don't grade the coin. We don't claim it's authentic. We just record what we measured. The buyer interprets.
This document records measurements only. MeltMath does not authenticate or grade coins.
The match percentages and spec-compliance flags are statistical comparisons against published Morgan dollar specifications, not guarantees of authenticity. Re-verification by the recipient is encouraged.
Not affiliated with PCGS or NGC.