There were several version of What's My Line? broadcast all over the world. Here are the details.
Eamonn Andrews (who once guest hosted for John Daly in the US version) was the host for the original British series, except in the first episode where the host was Gilbert Harding.
In the UK, the host's position, or "moderator", was called the "chairman."
Panelists included Elizabeth Allan, Lady Isobel Barnett, Jerry Desmonde, Gilbert Harding, Barbara Kelly, Marghanita Laski and David Nixon.
Eamonn Andrews returned to host the revived series, with panelists including Penelope Keith, Angela Rippon, Ernie Wise and Jilly Cooper;
After Andrews died, Penelope Keith took over as host.
The show was revived once again by Meridian Television in the mid-1990s, hosted by Emma Forbes.
A special one-off edition hosted by Hugh Dennis was produced for BBC Four in 2005, as part of a season about British culture in the decade immediately following World War II. An edition of the original series (from 5 October 1957) was also shown on BBC Four as part of this season.
The German version was called Was bin ich?, which translates from German to English as What am I? and was hosted by Bavarian Robert Lembke.
The show ran from 1955 to 1958 and again from 1961 to 1989.
It was broadcast on the TV station ARD (First German Television).
Lembke, at that time head of the news division of the Bavarian Radio (BR), bought the rights to the television format during a visit to the English BBC in 1954.
Lembke later was the head of the German Olympic Centre for the Olympic Games at Munich, 1972.
The best-known German panel consisted of district attorney Hans Sachs, actress Marianne Koch, TV announcer Annette von Aretin, TV announcer Anneliese Fleyenschmidt, and Guido Baumann, head of the Swiss radio and TV station "DRS".
The guests received 5 Deutschmarks (DM) for each "no" answer, for a total prize of 50 DM if their profession was not guessed by the time the panel had given 10 "no" answers.
The French Canadian version of What's My Line? was called Chacun son Métier. In the French language, the full phrase is either "à chacun son métier" or "chacun à son métier," but the program was simply called Chacun son Métier which translates from French to English as To Each His Job or To Each His Trade.
In 1959, the host of the French Canadian version, Louis Morisset, appeared as a contestant on the US version, on EPISODE #448 on January 18, 1959.
This alternate Canadian version was aired in Canada from 1954 to 1959.
In 1956, the host of the Brazilian version, Heloísa Helena, appeared as a contestant on the US version, on EPISODE #341 on December 16, 1956.
The Venezuelan version of What's My Line? was called Mi Trabajo y I, which roughly translates from Spanish to English as My Job and I.
In 1961, the director and moderator of the Venezuelan version, Jacques Lemoine, appeared as a contestant on the US version, on EPISODE #594 on December 24, 1961.