Increase the value of your coin with grading by NGC
Why do clients trust NGC grading?
Grading according to the international coin grading scale
Trusted expert verification by NGC standards, recognized worldwide by collectors and investors. With a transparent and objective evaluation, your coin’s value and market trust grow significantly
Protection against damage
The special NGC capsule securely protects the coin from dust, moisture, and physical damage, preserving its original condition for decades
Authenticity guarantee
Professional authentication provides reliable protection against counterfeits. Each coin comes with a certificate confirming its authenticity and market recognition
How much more is it worth once graded?
Examples of realized sales
Sold February 17, 2024
Poznański Dom Aukcyjny
Condition VF
Sold December 29, 2024
MARCINIAK | DOM AUKCYJNY
Condition AU 53
Sold September 21, 2019
Poznański Dom Aukcyjny
Condition XF
Sold March 16, 2024
Antykwariat Numizmatyczny - Niemczyk Michal
Condition AU 55
Sold June 27, 2016
Spink UK
Condition XF
Sold September 21, 2024
Antykwariat Numizmatyczny - Niemczyk Michal
Condition MS 62
Over 52 million coins already graded
With the world’s largest database of certified coins — the NGC Census — you can track the populations of most coins worldwide, determine their rarity, and assess the investment potential of your coin
| Year/Mint | Denom | Desig | Total | AU Details | 50 | 53 | 55 | 58 | UNC Details | 60 | 61 | 62 | 63 | 64 | 65 | 66 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1925 | G20Z | MS | 1,017 | 3 | 10 | 34 | 2 | 9 | 70 | 292 | 407 | 165 | 25 | |||
| 1925 | G20Z | MSPL | 11 | 6 | 4 | 1 |
20 zloty 1925 "Bolesław I the Brave"
- Total Graded: 1028
- Low grade: AU
- Average Grade: 64
- High Grade: 66
- Grade
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Do you have an NGC certificate?
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NGC Global Locations
NGC is affiliated with many of the largest and most respected names in the world of numismatics. It also has five offices, 22 official submission centers, and thousands of authorized dealers worldwide
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+22 official submission centers
+thousands of dealers worldwide
