From
Letterheady.com:
Here are some interesting and historic letterhead designs to check out.
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Walt Disney Productions, 1935

Twentieth Century Fox Film Corporation, 1943

The Tonight Show Starring Johnny Carson

The Office of Johnny Cash, c.1960

SAAB Cape Cod was located on Route 6A, W. Barnstable, Massachusetts. Apparently at one time Kurt Vonnegut was the manager, this was his letterhead.

Nat King Cole, 1964

Metro-Goldwyn-Mayer, 1937

Marvel Comics

M. J. Winkler, 1925

Lawrence Welk, 1958

Sometimes the simplest design is the most effective.

Richard Ramirez has a killer letterhead design.

Frank had a cool typographic logo.

Eva Peron, 1951

London design firm, Design Conspiracy, 2008

Contemporary Hotel, 1971

Anheuser Busch, 1934

Daily Graphic, 1873

Albert Einstein, 1932

This is one of my favorites. It's clear, concise, and keeps with the company's theme.

Coca Cola, 1937

Charles M. Schultz Creative Associates, 1997