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The more exacting the workmanship of the moving parts, the more accurate the clock was. From invention through to the middle of the twentieth century, developments in clock-making focused on making the moving parts work as accurately as possible. Developments in metal technology and in miniaturization, the lubrication of small parts, and the use of first, natural sapphires (and then artificial sapphires) at the spots that received the most stress (the jeweled movement) all became integral components of horological science. Small pocket watches, perhaps two to three inches (five to seven centimeters) in diameter, were available by the end of the nineteenth century. Mechanical wristwatches were an everyday item in the United States by the 1960s. And yet, the central problem faced by watch and clockmakers remained the same: mechanical parts wear down, become inaccurate, and break. 1. Duplicate Product. 2. Some Functions are not working.