Exact value will depend on condition, but the silver content makes them worth at least $6.58 at today's silver price (90% silver).
There were/are no 1958 one dollar gold coins in U.S. currency
The San Francisco Mint did not make any half dollars after 1954. If your coin has a mint mark it must be a D for Denver. In any case as of 06/2008 it's worth about $7 for its silver content.
It's common and circulated coins are only valued for the silver, about $12.00
Cents, nickels, dimes, quarters, and half dollars were struck at both Philadelphia (no mint mark back then) and Denver (D mint mark)
Sorry but no U.S. coins dated 1958 weigh "One Troy Ounce". Look at the coin again an post new question.
Denver Johnson was born on 1958-10-17.
Uk gold coins come in various sizes and the value depends on the size.
The average is 3 to 5 cents each
The Texan - 1958 The Duchess of Denver 1-15 was released on: USA: 5 January 1959
Lassie - 1954 1958-08-24 was released on: USA: 24 August 1958
Robert Ames Bennet was born in 1870, in Denver, Colorado, USA.
Plated coins are considered to be altered pieces. There were over 800 million 1958-D cents minted so anything that's been damaged is only worth a penny.