Pennyweight
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A pennyweight is a unit of mass equal to 24 grains, 1⁄20 of a troy ounce, 1⁄240 of a troy pound, 48⁄875 avoirdupois ounce and exactly 1.55517384 grams. It is abbreviated dwt, d standing for denarius –
17th-century Irish weight, 8 dwt
Irish gold pistole, bearing its weight (4 dwt 7 gr) (National Museum of Ireland – Decorative Arts and History)
Silver half crown struck in Ireland c. 1642 with weight, 9dwt: 16gr (15 grams) stamped onto it.
Grain (unit)
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A grain is a unit of measurement of mass, and in the troy weight, avoirdupois, and apothecaries' systems, equal to exactly 64.79891 milligrams. It is nominally based upon the mass of a single ideal se
Pennyweight
…A pennyweight (dwt) is a unit of mass equal to 24 grains, 1⁄20 of a troy ounce, 1⁄240 of a troy pound, 48⁄875 avoirdupois ounce and exactly 1.55517384 grams. It is abbreviated dwt, d standing for denarius…
The small golden disc close to the 5 cm marker is a piece of pure gold weighing one grain. Shown for comparison is a tape measure and coins of various world currencies.
A box of .38 Special (9.1 mm) cartridges that have 148-grain (9.6 g) bullets
A five-grain aspirin. The usage guidance label on a bottle of aspirin indicates that the dosage is "325 mg (5 gr)".