![A treatise on the art of decyphering, and of writing in cypher. With an harmonic alphabet (1772) [Leatherbound] - Exclusive Design](http://shop.thegci.shop/cdn/shop/files/2E558084-755E-E47B-EDF2-5AC15FFC958E_36ee9704-163d-48a6-9040-22fb5b2a5149.webp?v=1788324844&width=120)
A treatise on the art of decyphering, and of writing in cypher. With an harmonic alphabet (1772) [Leatherbound] - Exclusive Design
$11.38
Skip to product information
![A treatise on the art of decyphering, and of writing in cypher. With an harmonic alphabet (1772) [Leatherbound] - Exclusive Design](//shop.thegci.shop/cdn/shop/files/2E558084-755E-E47B-EDF2-5AC15FFC958E_36ee9704-163d-48a6-9040-22fb5b2a5149.webp?v=1788324844&width=3840)
![A treatise on the art of decyphering, and of writing in cypher. With an harmonic alphabet (1772) [Leatherbound] - Exclusive Design](http://shop.thegci.shop/cdn/shop/files/2E558084-755E-E47B-EDF2-5AC15FFC958E_36ee9704-163d-48a6-9040-22fb5b2a5149.webp?v=1788324844&width=3840)
A treatise on the art of decyphering, and of writing in cypher. With an harmonic alphabet (1772) [Leatherbound] - Exclusive Design
$11.38
A treatise on the art of decyphering, and of writing in cypher. With an harmonic alphabet (1772) [Leatherbound]