Posted 11/22/2015 10:23 pm
There are two correct answers to your question: 1992 and 2007.
Canada's NCLT commemorative silver dollars have undergone multiple composition changes since their introduction in 1971.
Upon launch of the series, the composition of the commemorative silver dollars was 50% silver, 50% copper. These coins weighed 23.30 grams and had a silver content of 11.65 grams. The 50/50 composition was used for the dollars from 1971 through 1991.
In 1992, the composition was changed to 92.5% silver,7.5% copper (sterling silver). With the changes, the weight increased to 25.175 grams with a silver content of 23.29 grams. This composition was used through 2002.
Beginning in 2003, the RCM switched to 99.99% fine silver planchet for the silver dollar commemoratives. The weight of the coins was maintained, however, at 25.175 grams; this yielded a silver content of 25.172 grams. The "pure" silver planchets were used through 2006.
In 2007, the planchet specifications returned to those used from 1992 through 2002. Namely, planchets of sterling silver (92.5% silver, 7.5% copper) with a weight of 25.175 grams and a silver content of 23.29 grams. These specifications were used for all 36 mm silver dollars through 2011, with two exceptions: the 2008 Armistice dollar and the 2010 Sun dollar.
Each of the exceptions was struck in high relief which required a heavier planchet. The composition remained sterling silver, but the weight for each coin increased to 30.0 grams which yielded a silver content of 27.75 grams - the most silver of any of the NCLT commemorative silver dollars.
In 2012, the RCM switched back to 0.9999 fine planchets for its commemorative silver dollars; it also reduced the overall weight of the coins. The weight was set at 23.17 grams - the lightest silver weight for the long-running series.
The 1992 "Double Dollar" Proof Set is the first to include a sterling silver commemorative dollar. It featured the Kingston to York Stagecoach design.
Canada's NCLT commemorative silver dollars have undergone multiple composition changes since their introduction in 1971.
Upon launch of the series, the composition of the commemorative silver dollars was 50% silver, 50% copper. These coins weighed 23.30 grams and had a silver content of 11.65 grams. The 50/50 composition was used for the dollars from 1971 through 1991.
In 1992, the composition was changed to 92.5% silver,7.5% copper (sterling silver). With the changes, the weight increased to 25.175 grams with a silver content of 23.29 grams. This composition was used through 2002.
Beginning in 2003, the RCM switched to 99.99% fine silver planchet for the silver dollar commemoratives. The weight of the coins was maintained, however, at 25.175 grams; this yielded a silver content of 25.172 grams. The "pure" silver planchets were used through 2006.
In 2007, the planchet specifications returned to those used from 1992 through 2002. Namely, planchets of sterling silver (92.5% silver, 7.5% copper) with a weight of 25.175 grams and a silver content of 23.29 grams. These specifications were used for all 36 mm silver dollars through 2011, with two exceptions: the 2008 Armistice dollar and the 2010 Sun dollar.
Each of the exceptions was struck in high relief which required a heavier planchet. The composition remained sterling silver, but the weight for each coin increased to 30.0 grams which yielded a silver content of 27.75 grams - the most silver of any of the NCLT commemorative silver dollars.
In 2012, the RCM switched back to 0.9999 fine planchets for its commemorative silver dollars; it also reduced the overall weight of the coins. The weight was set at 23.17 grams - the lightest silver weight for the long-running series.
Quote:
Also which double dollar set was the first sterling silver.
Also which double dollar set was the first sterling silver.
The 1992 "Double Dollar" Proof Set is the first to include a sterling silver commemorative dollar. It featured the Kingston to York Stagecoach design.
Collecting history one coin or medal at a time! (c) commems. All rights reserved.
