Calfskin n. : The hide or skin of a calf; or leather made of the skin.

Example:
How do you tell if something is real leather/Calfskin?

Taxonomy
calf, calves, weaners, mother, cattle, weaned, cows, birth, dairy cows, nine months, free encyclopedia, Calf rearing, heifer, dogie, beef, Veal calves, bull calf, female calf.

Defination from the web:
... The hide is used to make calfskin. The fourth compartment of the stomach of slaughtered milk-fed calves is the source of rennet. ...