Image:Wiki-thalers.jpg

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Various thalers from Germany and Austria with size comparison to a United States quarter (bottom center). Clockwise from top left: Saxe-Altenburg 1616 Thaler reverse, 1592 Saxony Three Brothers Thaler reverse, 1701 Austria (Hall) Thaler of Leopold I (the Hog-mouth) obverse, 1592 Saxony Three Brothers Thaler obverse. Center: 1635 Austria (Hall) Double Thaler obverse.

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U.S. quarter

This image has a coin in it to indicate scale.

Do not use object such as coins for scale, as they will require people unfamiliar with them to look up the dimensions or guess, both of which defeat the purpose of the object in the first place. Coins are particularly bad as they can reinforce a geographical bias.

Please photograph a ruler with the subject or add a scale marking via an image editor instead. SI/metric units are the most commonly used worldwide (see metre, 1 E-2 m).

Examples of good practice: with (metric & imperial) ruler and with superimposed line.
Examples of bad practice: here.

A tape measure

Common coin diameters for reference:

  • U.S. and Canada:
    • 1¢: 19 mm, 0.75 in;
    • 5¢: 20 mm, 0.79 in;
    • 10¢: 18 mm, 0.71 in;
    • 25¢: 24 mm, 0.95 in;
    • 50¢: 30 mm, 1.18 in;
    • $1: 26 mm, 1.02 in;
    • $2: 28 mm, 1.10 in.
  • UK
    • 1p: 20.32 mm, 0.80 in;
    • 2p: 25.91 mm, 1.02 in;
    • 5p: 18.00 mm, 0.71 in;
    • 10p: 24.50 mm, 0.96 in;
    • 20p: 21.40 mm, 0.84 in;
    • 50p: 27.30 mm, 1.07 in;
    • £1: 22.50 mm, 0.89 in;
    • £2: 28.40 mm, 1.12 in.
  • Eur
    • 1¢: 16.25 mm,
    • 2¢: 18.75 mm,
    • 5¢: 21.25 mm,
    • 10¢: 19.75 mm,
    • 20¢: 22.25 mm,
    • 50¢: 24.25 mm,
    • 1€: 23.25 mm,
    • 2€: 25.75 mm,

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