Marconi 365 B, spark key.
More info about Marconi keys type 365, by Wyn Davies and first
published in Morsum Magnificat n. 74  march/april 2001:
Page 1 - Page 2 - Page 3 - Page 4 - Page 5

Marconi morse key

 

With cover

Marconi 365B

 

Label in front of the key

Marconi telegraph key



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