Fiat currency that was backed by gold
I presume you mean representative currency - eg notes that can be exchanged freely for the commodity they represent; Or perhaps fiduciary money, in which the notes can theoretically be traded for the commodity with a specified person or organisation, and whose value depends upon how trustworthy that person or organisation is thought to be.
Fiat currency is defined by the fact that it is
not backed by a commodity, so "Fiat currency that was backed by gold" is a contradiction - a logical impossibility.
and gold by itself wasn't perfect but it worked for hundreds of years.
...until the industrial revolution turned a formerly static and agrarian economy with very low social mobility, into a rapidly changing urban economy with lots of opportunities for advancement, innovation, invention, and personal improvement.
If you pine for the good old days, when most people did the exact same job as their grandfather, in the same way, with the same tools; And when, for the vast majority, that meant back-breaking work in muddy fields, which barely made enough to keep most of their family alive, in a good year; With no light at night, no plumbing, no healthcare, and no say in how society should be ordered (unless you were one of a tiny number of nobles) - if that's the world you long to live in, then a gold-based currency will probably work
fairly well for you, most of the time.
You can buy livestock or land or grain with gold; But you can't buy a flatscreen TV with gold, because it is impossible to have both a commodity money economy and a flatscreen TV producing economy in the same time and place.
The sort of civilisation that can use gold as money is not the same sort of civilisation thet can mass produce consumer electronics.