Diagnostic Controls & Presets First California Private Gold Coin Struck
Diagnostic Forensic Readings
Forensic Attribution Diagnostic
Real-time metallurgical and die variety cross-examination verified against certified populations.
Technical Breakdown: Physics, Metallurgy & Die Diagnostics
Location: Benicia, California (May 1849 start)
Arriving from New York with a drop press and rolling machinery, NGN minted the very first private gold coins in California history, beating Moffat & Co. and the Miners' Bank by several weeks.
Purity: ~895 Fine Native Gold (No artificial copper added)
The legend 'CALIFORNIA GOLD WITHOUT ALLOY' proudly stated that NGN melted raw placer gold dust directly into planchets without adding copper alloy, giving the coins their distinct greenish-golden luster.
Varieties: Plain Edge vs Reeded Edge (Period vs No Period)
Most NGN five-dollar coins were melted down in 1851–1852 by the US Assay Office of Gold, leaving surviving specimens as iconic crown jewels of California Gold Rush numismatics.
Documented Benchmark Auction Records
Ex-Simpson & Clifford Collections. The finest certified NGN specimen; blazing olive-gold luster with sharp eagle feathers and complete date.
Rare Kagin-3 plain edge variety; needle-sharp 'CALIFORNIA GOLD WITHOUT ALLOY' lettering and pristine fields.
Forty-niner commercial survivor showing honest pocket friction; full central shield with numeral '5' and bold '1849' date.
Frequently Asked Questions
Why is the 1849 Norris, Gregg & Norris coin famous?
The 1849 Norris, Gregg & Norris (NGN) $5 gold coin was the very first private gold coin struck in California following the discovery of gold at Sutter's Mill in 1848. Struck in Benicia, California in May 1849, it was the first coin to bring monetary order to the chaotic gold rush economy.
Who were Norris, Gregg & Norris?
The firm consisted of Thomas H. Norris, Charles B. Gregg, and Hiram A. Norris. They were engineers and businessmen from New York who packed a complete coining press, rolling mill, and stamping dies onto a ship around Cape Horn, setting up their mint in Benicia on the Carquinez Strait.
What does 'CALIFORNIA GOLD WITHOUT ALLOY' mean?
Official United States federal gold coins were alloyed with 10% copper to make them durable. NGN took raw placer gold dust directly from miners, melted it, and stamped it into coins without adding copper or other base metals ('without alloy'). This resulted in an unrefined natural alloy of approximately 89.5% gold and 10.5% natural silver.
What are the major die varieties of the NGN $5 coin?
Numismatists classify NGN coins into four primary varieties cataloged by Donald Kagin: (1) Reeded Edge with period after date (Kagin-1); (2) Reeded Edge with period after date and 5 DOLLARS (Kagin-2); (3) Plain Edge with no period after date (Kagin-3); (4) Reeded Edge with no period after date (Kagin-4).
Why are Norris, Gregg & Norris coins so rare today?
In 1851 and 1852, the United States Assay Office of Gold in San Francisco melted down virtually all circulating private coins to produce official $50 octagonal slugs. An estimated 95% of the original NGN mintage was destroyed, leaving only approximately 250 to 300 surviving specimens today.
What is the weight and diameter of the NGN $5 coin?
It weighs approximately 130 grains (8.42 grams), which was slightly heavier than the standard federal $5 half eagle (129 grains). It measures 22.5 millimeters in diameter.
How can you verify that an NGN $5 coin is genuine?
Authentic coins have an Archimedes specific gravity of approximately 17.0 to 17.4 (matching native unrefined California placer gold). Modern cast replicas have an SG below 12 and display spongy, bubbly fields and rounded letter contours.