NMLP P-002409 · Point of issue · minted 2026-07-04

The Sign of Four

Arthur Conan Doyle · Spencer Blackett · 1890

First book edition, October 1890, after the February 1890 appearance in Lippincott's Monthly Magazine as 'The Sign of the Four'

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New Mexico Literacy Project — Point of issue NMLP P-002409 for "The Sign of Four" by Arthur Conan Doyle (https://newmexicoliteracyproject.org/id/point/p-002409, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).