A 1919 poster for the eighth episode of the fifteen-chapter serial The Master Mystery. The serial is generally credited with putting one of the earliest screen robots on film - a walking automaton - years before the metal figures of the German studios. It survives, unusually for a serial of its date, in near-complete form. The episode number given its own display block, so a theatre could show returning patrons exactly where the story stood. Escape, sold fifteen weeks running.

Maker: Unknown
Date: 1919
Medium of the original: Poster
Original held by: Wikimedia Commons
Credit: Wikimedia Commons · via Wikimedia Commons
Rights: Cleared for print
Catalogue number: PA-00781

As chosen: 12 x 18 in, art print, classic frame
Picture	12 x 18 in
Outside size	13.6 x 19.6 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
8 x 12 in	278	Excellent	Trimmed 0.8%
12 x 18 in	185	Good	Trimmed 0.8%

Sizes withheld
Size	Why
8 x 10 in	Wrong shape: a 16% crop
11 x 14 in	Wrong shape: a 14% crop
12 x 16 in	Wrong shape: a 10% crop
16 x 20 in	Wrong shape: a 16% crop
16 x 24 in	139 dpi; a historical scan is never enlarged
18 x 24 in	Wrong shape: a 10% crop
20 x 30 in	111 dpi; a historical scan is never enlarged
24 x 30 in	Wrong shape: a 16% crop
24 x 36 in	92 dpi; a historical scan is never enlarged
30 x 40 in	Wrong shape: a 10% crop
36 x 48 in	Wrong shape: a 10% crop
40 x 60 in	55 dpi; a historical scan is never enlarged