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1. "An item which is at least 100 years old and is collected or desirable due to rarity, condition, utility, or some other unique feature. Motor vehicles, power tools and other items subject to vigorous use in contrast, may be considered antiques in the US if older than 50 years, and some electronic gadgets of more recent vintage may be considered antiques. Another general rule of thumb is 75 years for most objects to become antiques."
2. "Any piece of furniture or decorative object or the like produced in a former period and valuable because of its beauty or rarity."
In the United States, the 1930 Smoot-Hawley Tariff Act defined an antique as "works of art (except rugs and carpets made after the year 1700), collections in illustration of the progress of the arts, works in bronze, marble, terra cotta, parian, pottery or porcelain, artistic antiquities and objects of ornamental character or educational value which shall have been produced prior to the year 1830." 1830 was roughly the beginning of mass production in the US and 100 years older than 1930 Smoot-Hawley Tariff Act.
These definitions allow people to make a distinction between genuine antique pieces, vintage items, and collectible objects.