What is the value of a 1793 US silver dollar?

Answer 1

There were no US Silver Dollars minted in the year of 1793. The first Silver Dollar coin minted was the Flowing Hair Dollar and it first year of mintage was 1794.

However

The first United States legal tender silver dollar was minted, not here, but in Mexico City. It was the Eight Reales, the "Pieces of Eight," whose scrolls on its obverse were the origin of the American dollar sign. The Eight Reales was the largest and heaviest silver coin minted for over 200 years, actually bigger and heavier than the Morgan Silver Dollar. These Eight Reales were minted between 1772 and 1826, the beginning of American silver coinage.

America's first silver dollar, a type of Spanish milled dollar, was minted at some of the oldest mints in the New World. Mexico, Peru, and Bolivia were among the countries to produce this treasured coin. It was the basic currency of our Founding Fathers, widely circulated during the Colonial and Revolutionary eras and used as legal tender until 1857.

The "piece of 8," as the coin is often called, had a value of 8 reales. Merchants would break the coin into eight pieces, each commonly know as a "bit," allowing for purchases of other than whole dollar amounts.

The value fluctuates, as there are 'replica' coins out there. I would look for the 'chop marks' that were used by merchants to mark the coins as they changed hands.