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Knurling on 2004 to 2018 circulating canadian coins

By castor    |   Tuesday, 29 January 2019

Since 2004, Royal Canadian Mint issued 19 circulating coins with different colored design for several denomations.

This article illustrates my observations as a collector who wanted to know more about who it's made. It isn't meant to be technical or scientific. By looking at the coins, which the color has been removed, we can see the changes that were made over the years.

The color

From 2004 to 2011, it's possible to see a transparent vernish-like substance near the color. Here are 4 examples of this.

How the color was applied changed in 2015.

Under the color

Pictures of knurling below are made with a 200x zoom. Because of its engraving characteristics, the 25 cents 2010 - Poppy circulation coin is unique.

25 cents 2004 - Poppy

First colored circulating coin produced by the Royal Canadian Mint.

The design of the poppy is under the color. Round convexe knurling.

25 cents 2006 - Breast cancer

Square convexe knurling.

25 cents 2008 - Poppy

Square convexe knurling.

25 cents 2009 - Men's hockey

Square convexe knurling.

25 cents 2009 - Women's hockey

Square convexe knurling. Red arrows show the design difference between the colored and normal coins.

25 cents 2009 - Cindy Klassen

Square convexe knurling.

25 cents 2010 - Poppy

Unstructured convexe and concave knurling.

Two dots varieties.

25 cents 2011

25 cents 2012-2013

25 cents 2015 - Flag

Knurling dots became closer. Square-shapped base with flat round top. Took more time to remove the paint while soaking in acetone.

25 cents 2015 - Poppy

Square-shapped base with flat round top.

25 cents 2017 - 150 years

Square-shapped base with flat round top. Took several hours, instead of 5 to 15 minutes, to remove the paint in acetone.

2 dollars 2017 - 150 years

Square-shapped base with flat round top.

2 dollars 2018 - Armistice

Pyramid-shapped knurling with flat round top.

Knurling overview - 2004 to 2018

In my opinion, Royal Canadian Mint is still trying to figured out the best knurling for the paint.

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