This logo was taken from the front cover of the CR100 receiver manual circa 1940. At that time the comany was called "Marconi's Wireless Telegraph Company".

During the 1950's and 60's, Marconi did not use a generic  equipment logo. Instead, they opted to include the equipment model name by adding it in between the double quotation marks. 
(Logo courtesy Marconi International Marine) 

The newer version of the logo did not incorporate the model name. Rather, the model name was applied to the front panel as a separate item and was mounted directly below the Marconi Marine logo. 

Contributors and Credits:

1) Marconi International Marine

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Oct 3/12