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The Hagelin CD-57 Pocket Cryptographer is a pocket-sized (for largish pockets) cipher machine which works on the same principal as the M-209 Converter. I’ll write a more detailed description later; for now, here are some pictures of my CD-57 that I found on eBay.
What is after market value of a CD-57 pocket cryptographer in good working condition?
I haven’t been paying attention to CD-57 prices over the last several years. I would guess, somewhere in the $1,000 to $3,500 range.