Sorry fren, you're looking at it backwards. In 1930, one once of gold was valued at $30. $1 dollar today buys the same amount as four cents did in 1930. If, in 1930, someone buried a can with $30 in it and another with one ounce of gold in it and you happened to find them both, one can would be worth $30, the other can would be worth close to $2000 in today's valuation. One ounce of gold in 1930 buys about the same amount of goods as one ounce of gold does today.
Sorry fren, you're looking at it backwards. In 1930, one once of gold was valued at $30. $1 dollar today buys the same amount as four cents did in 1930. If, in 1930, someone buried a can with $30 in it in and another with one ounce of gold in it and you happened to find them both, one can would be worth $30, the other can would be worth close to $2000 in today's valuation.