Trying to decide which key to use tonight in my small shack on Kauai... 

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The usual CT-Asia from Ukraine...

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or one of the Japanese keys I recently found in Tokyo.

On the left, the older Dentsu-seiki telegraph key (same company before they started to use the Hi-Mound brand). 

On the right, the newer HK-703 Hi-Mound Key.
 
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Dentsu-seiki key was purchased in the Tokyo Fleamarket at Oi Racecourse.  The seller was asking 3000 yen (about US$20) but I could not resist my instinct to negotiate.  We made the deal at 1500 yen (about US$10).   I don't know the model number - it is a simple, inexpensive key but of good quality and feel.

Later I visited the Tokyo Radio Department Store building in Akihabara and found a newer HK-703 Hi-Mound Key in excellent condition offered at a price of 4500 yen (about US$30) as well as some very useful small electronic parts, connectors, knobs, and hardware from the vendor booths. 

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Steve WD8DAS  
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Radio is your best entertainment value.  
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Mein Ohr ganz nah am Weltempfänger...