Diagnostic Controls & Presets Famous 'In God We Rust' Grease Error
Diagnostic Forensic Readings
Forensic Attribution Diagnostic
Real-time metallurgical and die variety cross-examination verified against certified populations.
Technical Breakdown: Physics, Metallurgy & Die Diagnostics
During high-speed coining at the Philadelphia Mint in 2005, heavy industrial lubricant grease and metal shavings packed into the incuse letter 'T' of the motto 'IN GOD WE TRUST' on an obverse working die. Because grease is an incompressible liquid, when the die struck blank quarter planchets, the grease prevented planchet metal from filling the 'T' cavity, creating the hilarious and viral 'IN GOD WE RUST' error.
ΔV / V = -P / Kbulk ≈ 0
Where the bulk modulus of industrial lithium grease Kbulk ≈ 2.2 GPa resists coining compression. The grease plug prevents the planchet's copper-nickel clad layer from extruding into the 'T' cavity while leaving unbroken, undisturbed cartwheel luster in the field.
A real struck-through grease error retains 100% of the coin's original satiny mint bloom across the missing letter area. If the letter was filed off after leaving the mint, microscopic rotational scratches and metal thinning will be glaringly obvious under a 10x loupe.
Documented Benchmark Auction Records
Top certified grade. Breathtaking satin luster with 100% complete obstruction of the letter 'T', reading 'IN GOD WE RUST'.
Choice gem uncirculated error. Flawless frosted cheek with clean, smooth field where the letter 'T' was clogged.
Pulled directly from pocket change by an alert cashier. Bold missing 'T' with light commercial friction.
Frequently Asked Questions
What is the 'In God We Rust' 2005 Kansas Quarter?
It is a famous mint error on the 2005-P Kansas State Quarter where machine grease and dirt filled the letter 'T' on the obverse die, preventing the letter from being stamped onto the coin so that the motto reads 'IN GOD WE RUST'.
How common is the 'In God We Rust' error?
It is one of the more accessible modern mint errors, but specimens with 100% complete obstruction of the 'T' and pristine uncirculated surfaces are scarce and highly sought after by collectors.
How much is an 'In God We Rust' quarter worth?
In circulated condition (found in pocket change), they sell for $35 to $50. Uncirculated examples graded MS-65 sell for $100 to $150, and top-grade MS-66 coins sell for $250 to $300 at auction.
Can you fake the 'In God We Rust' error by filing off the 'T'?
People try to scrape or polish the 'T' away with rotary tools, but fake coins are easily spotted: filing removes the coin's original mint luster and leaves scratch marks. On a real error, the mint luster flows smoothly across the flat field where the letter should be.
Did this error happen on other state quarters?
Struck-through grease errors occur across many dates and denominations, but the Kansas quarter is the most famous because the missing 'T' created a humorous, readable phrase ('RUST').
Are partial grease-filled Kansas quarters worth money?
Coins where a faint 'ghost' of the 'T' is still visible are worth less ($10 to $20) than coins where the letter is completely obliterated.
Where was the coin struck?
The famous 'In God We Rust' quarters were struck at the Philadelphia Mint and feature a small 'P' mintmark below 'IN GOD WE TRUST'.