Nights In Lankhmar
The base coin of the realm is the Bronze, which is equivalent to the Savage Worlds ‘dollar’ ($1 SW) value. In the books something that costs $1 SW would cost one bronze. A bronze will buy you a cheap ale, a well-made candle, or a very basic hat. Almost everything is priced in terms of the Bronze: haggling aside, a mug of watery beer is a bronze, a decent horse is 250 bronzes, and so on.
The main coin of the realm, however, is the Copper, which is worth 5 Bronzes. Most well-to-do people carry Copper coins, with Bronzes acting as change. (This is similar to how the $20 bill is the de facto bill for most U.S. transactions even though prices are set in dollars and cents.)
Below the Bronze is the Tin – a purer metal, true, but also a nickel-sized coin compared to the Bronze’s half-dollar size and less precious than the alloy. There are 10 tin coins to a Bronze, making a Tin roughly equivalent to a dime.
Above the Copper is the Silver, which is worth 10 Coppers. Above that… most people quit trying, but in Lankhmar some high class venues will accept Gold coins (worth 10 silver).
10 tin = 1 Bronze ($1 SW)
5 Bronze = 1 Copper
10 Copper = 1 Silver
10 Silver = 1 Gold
1 Gold = 10 Silver = 100 Copper = 500 Bronze = 5000 tin
After than you have to contend with gems, appraisal, and haggling. Most people just use writs of credit at this juncture. One the one hand gems are very valuable, measured in increments of Silver. On the other hand a gem is a gem is a gem, with few caring if the stone is diamond, amethyst or emerald. They are ultimately worth whatever the buyer is willing to part with.