Not every horloger was a grand maison. The Lasne shop on the rue Sainte-Croix-de-la-Bretonnerie kept its printed card exact and modest — a working watchmaker's paper, the kind slipped into a repaired watch's case on return. Ephemera like this is the closest surviving relative of the English watch paper tradition, and the Carnavalet's collection of Paris trade cards is one of the few places it survives at museum resolution, CC0, for walls.

Maker: Lasne (house), unknown engraver
Date: 19th century
Medium of the original: Engraving
Original held by: Musée Carnavalet, Paris
Credit: Musée Carnavalet, Paris · via Wikimedia Commons
Rights: Public domain, verified
Catalogue number: PA-00546

As chosen: 24 x 16 in, art print, classic frame
Picture	24 x 16 in
Outside size	25.6 x 17.6 in
Depth	0.9 in (22 mm)
Weight	[[REAL PROOF NEEDED: shipped weight per size and frame]]
Hanging	[[REAL PROOF NEEDED: hanging hardware Prodigi fits to this frame]]
Material	Enhanced matte art paper, 200 gsm; acrylic glazing
Made in	Charlotte, North Carolina, by Prodigi

Before a size goes on sale, the file is measured against it: pixels per inch at that size, how much of the picture a crop would lose, tone and sharpness. A size that fails is not offered, so there is nothing to choose wrong.

How the print check works

Sizes offered
Size	dpi	Grade	How it fits
12 x 8 in	354	Excellent	Trimmed 0.2%
18 x 12 in	236	Excellent	Trimmed 0.2%
24 x 16 in	177	Good	Trimmed 0.2%

Sizes withheld
Size	Why
10 x 8 in	Wrong shape: a 17% crop
14 x 11 in	Wrong shape: a 15% crop
16 x 12 in	Wrong shape: a 11% crop
20 x 16 in	Wrong shape: a 17% crop
24 x 18 in	Wrong shape: a 11% crop
30 x 20 in	141 dpi; a historical scan is never enlarged
30 x 24 in	Wrong shape: a 17% crop
36 x 24 in	118 dpi; a historical scan is never enlarged
40 x 30 in	Wrong shape: a 11% crop
48 x 36 in	Wrong shape: a 11% crop
60 x 40 in	70 dpi; a historical scan is never enlarged