How much is a fathing from the 1940s?

Answer 1

It really depends on the country of origin, but assuming a British farthing in average circulated condition, a few cents to at most a dollar or so unless you can identify it as a rare variety.

Answer 2

A fathing from the 1940s would not hold much value today. In good condition, they may be worth a few cents to a couple of dollars to a collector. However, their numismatic value is generally low.