Mule error on gold kilogram ‘Timber Wolf’ coin certified by NGC

Rare error on large modern coin identified by NGC, confirmed by Royal Canadian Mint

Numismatic Guaranty Corporation (NGC) recently certified an “extremely unusual mule error” of the 2017 $2,500 gold kilogram “In the Eyes of the Timber Wolf” coin issued by the Royal Canadian Mint.

A mule is a numismatic error in which the two sides of a coin were incorrectly paired. In this case, the large gold coin was struck with the obverse intended for the silver kilogram, which bears a denomination of $250 instead of the correct $2,500 denomination.

Modern coins struck with incorrect denominations are “virtually unheard of,” according to NGC. Adding to the significance of this piece is its low mintage—only 10 coins—and its high intrinsic value, which is about $40,000 USD at current gold prices. The mintage of the silver coins was also low with only 400 pieces.

The mule was struck with the obverse (shown above) intended for the $250 silver kilogram coin.


After NGC received the coin for certification, it contacted the Mint for further information.

In a statement, Mint officials confirmed as many as four of these mules may have been inadvertently struck and shipped to customers.

The silver and gold kilogram (32.15 troy ounces) Timber Wolf coins share a nearly identical reverse: the head of a northern timber wolf, staring straight ahead, creating a captivating effect. The eyes of the wolf, however, are colored differently on the two coins. On the silver coins they are gold-toned while on the gold coins they are green.

The error that was submitted to NGC received a grade of NGC Proof-70 Ultra Cameo. With a diameter of 101.6 mm (about four times the diameter of a U.S. quarter), it was encapsulated in an NGC “oversize holder” with a label that bears a description of the error and the coin’s grade.

Leave a Reply

Canadian Coin News


Canadian Coin News is Canada's premier source of information about coins, notes and medals.

Although we cover the entire world of numismatics, the majority of our readers are Canadian, and we concentrate on the unique circumstances surrounding collecting in our native land.

Send Us Your Event

Running an event? Send it to us and we will display it on Canadian Coin News!

Submit Event →

Subscribe To 26 Issues For Just $59.99/year

Subscribe today to receive Canada's premier coin publication. Canadian Coin News is available in both paper and digital forms.

Subscribe Now

We acknowledge the financial support of the Government of Canada through the Canada Periodical Fund of the Department of Canadian Heritage.