There are two sides to every coin.
There is also
Its weight.
Shape.
Size.
Colour
Metal content.
Organic accretions.
Diameter.
Depth.
Area of circulation.
Period of circulation.
Edge.
Embossing.
Scratches.
Minting.
Design.
Numismatic release.
Collection.
Abandonment.
Discovery.
Sharing.
Hoarding.
Cleaning.
Loss.
Gifting.
Heat retention.
Frigidity.
Damage.
Recycling.
Repudiation.
Flipped flight.
Winning.
Theft.