ユニオンアーミー暗号ディスク | 正確な南北戦争レプリカ

The laser engraving on the wood is way sharper than I expected, and the disks spin smoothly without sticking. I've been using it to teach my kids how actual Civil War messages got scrambled.

I picked this up for a Civil War history unit with my students and it works exactly like the original field cipher. Spinning the inner disk to line up the letters makes the whole encoding process click for them way better than any textbook diagram.

The laser engraving on the wood is crisp enough that the letters haven't faded after weeks of use. I've been using it to teach my kids how Civil War officers actually scrambled messages, and it works exactly as it should.