Facsimile

Etymology

From Latin "fac simile" ("make similar"), the imperative "fac" (make) plus "simile" (like). It began as an instruction and became a noun for a faithful reproduction; the machine that sent them down phone lines shortened it to "fax."

noun · /fak-SIM-uh-lee/
An exact copy or reproduction of something.
What it names
The right word when "copy" is too casual — a facsimile aims to duplicate every detail of the original.
Example
The museum displays a facsimile of the fragile manuscript while the original stays in the vault.
Related idea
A replica is a physical rebuild, often at a different scale or in new materials; a facsimile aims to match the original exactly, down to the marks on the page.