NGC Error Coins & Mint Varieties 2

Question 1

What causes a 'clipped planchet' error?

Accepted Answer

A malfunction in the blanking press that removes a portion of the planchet before it is struck

Answer

A planchet trimmed by the mint during final quality inspection

Answer

An edge-lettering malfunction during the production process

Answer

Damage to the coin's edge sustained after years of circulation

Question 2

The Sheldon variety numbering system was originally created to catalog which series of U.S. coins?

Accepted Answer

Large Cents

Answer

Morgan Silver Dollars

Answer

Trade Dollars

Answer

Draped Bust coinage across all denominations

Question 3

In numismatics, 'VAM' varieties specifically catalog die varieties for which coinage?

Accepted Answer

Die varieties for Morgan and Peace dollars, named after researchers Van Allen and Mallis

Answer

A grading methodology applied to all U.S. commemorative coins

Answer

A value assessment metric used for evaluating key-date coins

Answer

A visual appearance measurement system used by third-party grading services

Question 4

A 'lamination' error on a coin is caused by:

Accepted Answer

Impurities or defects in the planchet metal that cause surface layers to separate

Answer

An improper protective coating applied to the coin after minting

Answer

Two planchets accidentally bonded together during the rolling process

Answer

Insufficient striking pressure leaving design elements weak and peeling

Question 5

What is the key distinction between a 'mechanical doubled die' and a 'hub doubled die'?

Accepted Answer

Hub doubling occurs during die creation while mechanical doubling results from die bounce or shift during the actual strike

Answer

Mechanical doubling is more valuable to collectors than hub doubling

Answer

Hub doubling appears only on the date while mechanical doubling affects the entire design equally

Answer

Mechanical doubling occurs exclusively on proof coins struck at the San Francisco Mint

Question 6

A 'brockage' error coin is created when:

Accepted Answer

A previously struck coin remains in the coining chamber and impresses a mirror image of its design onto the next planchet

Answer

A planchet receives multiple off-center strikes in the same production run

Answer

A coin becomes so distorted it wraps around the die after repeated strikes

Answer

Two planchets are accidentally fed into the coining chamber simultaneously

Question 7

What is a 'split planchet' error?

Accepted Answer

A planchet that separated into two thin layers, either before or after being struck

Answer

A planchet intentionally cut in half by the mint for metallurgical quality testing

Answer

A planchet with a crack running from the edge toward the center

Answer

A planchet composed of two different metal layers laminated together intentionally