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Percentages of existing examples of old series of coins

Has anyone compiled percentages of existing examples of old series of coins?

Walter Breen cites a few figures: An estimated 3 to 6 percent of the large cents survived, 4 to 8 percent of the early silver, and 0.02 to 2 percent of the half cents. Any such figures have to be classed as estimates as there is no known way of determining exact numbers.

Do you have the dates when the Mints stopped striking silver coins and started striking the different clad coins?

Silver dimes: Philadelphia, November 1965; Denver, Feb. 14, 1966

Clad dime start: Philadelphia, December 1965; Denver, March 1966

Silver quarters: Philadelphia, July 1965; Denver, November 1965; San Francisco (no mintmark), January 1966

Clad quarter start: Philadelphia, August 1965; Denver, December 1965

90 percent silver halves: Philadelphia, April 1966; Denver, December 1965

Clad (40 percent silver) half start: Philadelphia, May 1966: Denver, Dec. 30, 1965

Why did the nickel and half dime circulate at the same time?

The half dime of 1794-1873 was silver. Before the Civil War, many silver coins were shipped out of the country to be melted. Some were hoarded during the Civil War, and for all practical purposes, the half dime did not circulate then. The nickel was intended to relieve the coin shortage and was used to phase out the Civil War fractional paper money.

Most references list the half dime production as beginning in 1794, but there are those who claim that the 1792-dated coins are business strikes and not patterns as listed. Why the argument?

Depending on the source, either 1,500 or 2,000 pieces were struck in 1792. Many saw circulation and are heavily worn. Those who argue that they were intended to circulate cite Washington’s letter in which he states, “There has been a small beginning in the coinage of half dimes, the want of small coins in circulation calling the first attention to them.”

Back in the days of visual inspection of struck coins, what percentages of gold and silver coins were rejected?

One set of figures I found shows that at Philadelphia just over 90 percent of the double eagles passed inspection, and the figure for the Peace dollars was just under 90 percent. However, from the ingot to the struck coin, the rejection rate was much higher. Only 32.4 percent of the gold coins, 36 percent of the subsidiary silver, and 51 percent of the silver dollars passed muster. The high rejection rate reflects the return of below -or above- standard weight planchets to be melted down and recast into ingots.