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• Silverton Repeating sounder: c. 1916.  Made in the Silvertown Telegraph Works on the Thames River in London England.
• Australian Radiotelegraph key: c. late 1930s.  Made by Amalgamated Wireless of Australasia.  Detail of label.  Note the key is called a manipulator, an early wireless term.
• Unmarked French spark key: c. 1908 - 1916.  There are two sets of high current contacts.  See explanation.
• Australian PMG key: This Post Master General design was used for a long time on Australian landlines, so hard to date.  Exact key is shown in W.W.I era Silverton catalog.
• Dyna Sideswiper: c. 1950. "29406 T : Standard Model," made in Paris France.
• Ducretet & Roger spark key: c. 1914-1919. Unusual French "oil break" design.
• MP - Pedersen spark key: c. 1920. Notice cooling fins on lower contact of this Danish made key.
• Portishead Radio key: This is one of 90 keys made in 1983 by the British Post Office's own shops for the ship to shore station, GKB, at Portishead.
• Swedish Öller style key: c. 1900.  Made by Lindholm and Wikstrom of Stockholm.  The design dates from Henric Öller's patent of 1857.
• Switch and Lightning Arrestor: c. 1890.  Unmarked French instrument.
• Great Northern Telegraph model 601 key: c. 1900.  Made in Copenhagen Denmark.
• French PTT key: c. 1913.  Made by Societe Industrielle Des Telephone, Paris.  Note lubrication holes on top of the fulcrum.
• Siemens Bros. key: c. 1910.  Made in London, England.
• German key: c. 1885.  Made by Willhelm Gurlt of Berlin.
• German "maus" key: c. W.W.II.  Mouse key with the cover open.
• Swiss PTT key: c. 1920.  Made by Hasler of Bern, Switzerland.  See description.

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Neal McEwen, k5rw@telegraph-office.com