Bartering.
Trade with Gold & Silver primarily. (still do to this day)
Was it gold or did they just trade things for what they wanted.
bartering
We used letters.
Money was invented long before the 1700s. The first "money" was just bartering, trading one thing for another thing. Then metal objects were introduced as money around 5000 B.C. The Lydians were the first to make and use coins, around 700 B.C. Please see the related link below for more information.
Barter
Was it gold or did they just trade things for what they wanted.
They didn't. You can't use something BEFORE it is invented.
bartering
benches
bikes
Buttons.
pickaxes
they was exchanging stuff and trading before money was invented
carriages
horses or their feet.
wall sockets
Brief case