Introduction

Die Crack

Like other cataloguing systems, "BWJM Numbers" describe the features of a coin.

BWJM Numbers help collectors describe a coin in a simple and concise way without having to share photos or describe the coin in a manner that may not be clear to others.

BWJM Numbers identify the following features:

  • Variety of counterfeit (Camel Toe vs. Montreal Mint)
  • Year of coin
  • Rotated dies
  • Die clashes
  • Obverse and reverse die cracks
  • Other defects (eg: weak strike, excess die metal)

Each component of the code is separated by a hyphen for readability.

Codes Used

Variety of Counterfeit
Year of Coin
  • Use the last two digits only
  • Combined with variety of counterfeit without hyphen (eg: "CT06")
  • Use "A" suffix for "serif" obverse variety (eg: "CT05A")
Rotated Dies
  • Rotations of up to ±15° are common and not catalogued
  • "RD" followed by angle of rotation
  • Example: "RD340", "RD065"
  • Angles are measured from 0° at the top going clockwise
Die Clashes
  • Obverse: "OC1", "OC2", etc.
  • Reverse: "RC1", "RC2", etc.
Obverse Die Cracks
  • Identified by a number: "1", "2", etc.
  • Numbers are grouped by year
  • Progressive cracks identified with lowercase letters: "3a", "3b", etc.
Reverse Die Cracks
  • Identified by a letter: "A", "B", etc.
  • Progressive cracks identified by a number: "E1", "E2", etc.
Weak Strikes
  • "WS"
Excess Die Metal
  • "EM"

Examples

CT02-OC2-A
  • Camel Toe, 2002
  • Obverse die clash "OC2"
  • Reverse die crack "A"
CT05-RD025-E3
  • Camel Toe, 2005
  • Clockwise 25° rotated dies
  • Reverse die crack "E3"
MTL05
  • Montreal Mint, 2005
CT06-1-C
  • Camel Toe, 2006
  • Obverse die crack "1"
  • Reverse die crack "C"

DISCLAIMER: This website is designed solely for educational and reference purposes. The collecting of counterfeit coins or currency is illegal and explicitly not condoned by this website.