Jim, N2EY, wrote:

20 wpm derives from the old 1923-24 "Amateur Extra
First Class" which chose 20 as double the old 10 wpm
standard. It was reintroduced in 1951 when the current
Amateur Extra class was created.

Both speeds are far below those required of experienced
professional Morse operators.

Are there any 'professional' Morse operators left who
earn their living by sending by hand and receiving by
ear? I am under the impression it is now strictly an
amateur endeavor.

Jim, K7JEB