A B C D E F G H I J K L M N O P Q R S T U V W X Y Z





DATE
- The statement fixed to a numismatic item which specifies the date and sometimes the place of manufacture, if a mintmark is with it.
DATE SET
- A collection of coins of similar grade that are organized by date and includes one coin or each date for which the denomination was issued. Often subdivided into Monarch series. See Type Set.
DATE COLLECTING
- Collecting coins on the basis of the date on the coin.
DEALER
- One who makes a full or part-time business of buying and selling coins to other dealers and collectors.
DEBASEMENT
- Debasement of a coin takes place when the issuing authority reduces the purity of the metal, lowering the intrinsic value of the coin but circulating it at par with the previous coins of the original purity. This happened in Canada in 1920 when the silver fineness was reduced from 92.5% silver to 80%. Another example was in 1968 when all silver coins were replaced with nickel.
DECIMAL SYSTEM
- Any monetary system which has a unit divided into one hundred smaller units. In Canada the decimal system is based on a dollar of 100 cents.
DEMONETIZE
- Withdraw a coin from use as money.
DENTICLES
- Tooth-like projections running inside the rim of a coin. Used to discourage counterfeiters.
DESIGN
- The totality of the details, either in relief or incuse, on a coin.
DESIGNER
- The artist who creates a coin's design. See also Engraver.
DETAILS
- Small features and fine lines in a coin's design, particularly those seen in the hair, leaves, and /or wreaths.
DEVICE
- The main element of the design on either side of a metallic numismatic object. For example, the obverse device is usually a portrait.
DIADEMED
- A coin where the portrait head has a headband or fillet as a sign of royalty.
DIE
- Engraved metal stamp used to strike the design of a coin, medal or token.
DIE AXIS
- The die axis of a coin is usually indicated by one or two arrows, indicating the position of the reverse design relative to that of the obverse. The obverse position is always indicated or assumed to be upright. Canadian coins have been struck with both major axis arrangements. In the Medal arrangement (designated ), the obverse and reverse designs are both upright. In the coinage arrangement ( ), the reverse is upside down relative to the obverse.
DIE BULGE
- A roundish, raise area on a coin caused by the swelling of a die.
DIE BURN
- A break (slight roughness) in the surface of a coin at its high points. Appears at first to be a form of wear but in fact is the result of an insufficient strike or poor planchet so the resulting coin fails to be completely struck. Commonly seen in the George VI series, particularly with the silver coins.
DIE CLASH MARKS
- Faint but observable impressions or portions of the obverse die upon the reverse of a coin or vice versa. See Clashed Die(s).
DIE CRACK
- A raised line appearing on a coin caused by a broken or cracked die.
DIE DEFECT
- An imperfection in a coin caused by a defective die.
DIE LIFE
- Refers to the number of coins which could be struck from an individual die. Each time a new set of dies was installed, the die setter would adjust the press until the coin was fully struck. The striking pressure could have been set higher or lower than normal, in order to emphasize either high quality coins or longer die life.
DIE POLISHING LINES
- The very fine, raised lines that appear on the surface of some coins, particularly those that are well struck. These lines result from the dies being polished leaving behind minute scratches on the die. These scratches will show as raised line on any coin subsequently struck from them.
DIE ROTATION
- See Rotated Dies.
DIE STATE
- A state or stage of a die's life distinguished from other states by new cracks or by polishing or something else happening to it but now preventing its further use.
DIE STRUCK FAKE
- A counterfeit coin produced from a fake die. Comparison of a suspect coin with one known to be genuine will often reveal minor difference.
DIE TRIAL, DIE STRIKE
- Is an impression of an unfinished or completed die in a soft metal to test that die. The planchet utilized in the trial can be of any size or shape, and is usually struck on one side only, creating a uniface specimen.
DIE VARIETY
- A coin which evidences the same characteristics as all other pieces struck from a given die or die pair, or from a die at a particular stage in its life. Refers to those die varieties such as shifted or doubled designs, over-mintmarks, and over-dates, extra metal, missing features, etc. See also Variety and Non-Die Variety.
DIP
- A liquid solution consisting of thiourea and a mild acid and is used to remove surface pollution and contaminants from coins. The dip has the undesirable effect of also removing the toning and protective oxide layers and consequently exposes the metal to further corrosive attack. Improperly used, dips can leave stains on coins. See also Trichlorotrifluoroethane.
DIPPED OUT LOOK
- A coin that has lustre that looks very subdued, flat or no life to it compared to the beauty and sparkle of new mint lustre. Coins that are treated many times in chemically active acid dips get this appearance. The excessive dipping results in the destruction of the lustre.
DIPPING
- The process of immersing a coin in a cleaning or Dip solution.
DIME
- Reference to a United States 10 cent piece and not the proper reference for a Canadian Ten Cent.
DISCOLOURATION
- A toning impairment that is unattractive.
DISCOVERY PIECE
- The actual coin for which a new (previously unknown to the issuing mint or the numismatic marketplace) variety is named.
DISPLAY
- A grouping of numismatic items, around some central theme, on show either in competition with other such displays or for general viewing purposes. A regular feature at most coin shows.
DOG
- Slang for a coin that is near worthless as a numismatic collectible, usually because of poor condition and when quantities can be purchased at higher grades at very little over Face or Bullion Value.
DOMINION CENTS
- See Provincial Cents.
DOMINION OF CANADA NOTES
- Notes issued by the Department of Finance of the Dominion of Canada before 1935, when the Bank of Canada notes were put into circulation.
"DOT" COINAGE
- Usually in reference to the 1, 10, and 25 cent piece dating 1936 that have a small raised dot on the reverse to denote they were struck on King George V specification coinage in 1937 but for King George VI while awaiting new dies.
DOUBLE DOLLAR
- Reference to the $2. gold coin of Newfoundland. This series has three denomination references on each coin: Two Hundred Cents, 2 Dollars, and Two Hundred Pence!
DOUBLE STRIKE
- A coin that has been struck twice from the same pair of dies; if the coin rotated between strikes, a doubling effect will be evident.
DOWNGRADING
- Replacing a coin in a collection with one of the same date and denomination but of lower overall quality. Not a typical collector objective.
DUPLICATE
- A piece identical to another, except it need not be in the identical state of preservation, ie. condition.
DRAWING BENCH
- Used to obtain a consistent final thickness for the planchet strip after it had been run through the rolling mill.




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