The mask red we use on screen is mixed for phones. On uncoated stock it goes brick. On gloss it goes candy. Neither is wrong, but they are not the same cover.
After mint we still print a proof in Bourton when a companion sheet is part of the job. If the proof fails, we adjust the print file, not the token. Collectors deserve to know which object is the reference.
Halftone dots that look charming at 72 dpi can clot at 300. We check the shoulder and the caption box, because those are where a Deadpool parody usually hides a second joke.
If you cannot visit, we post a trimmed proof with a daylight photo of the sheet on the bench. It is slower than a PDF. It is also the only way we will sign off an A2.
None of this is nostalgia for paper. It is because the collector series is sold as a cover, and covers were judged on stands, not in tabs.