This is not a practical thread way off topic…
But in a similar vein photogs who had six or more identical blad backs would nail file an additional notch in each so they could tell which back a film with eg a light leak or bad frame space came from... don't everyone do that with dark slides/film holders?
I had a couple of 4x5 holders that were a little wonky. I threw the worst one away, but put the other one (unmarked) back into circulation. I kind of like that John Cage randomness - knowing I'm in control of a lot of things... just not everything. (and I still get interesting prints from it, though sometimes I have to crop.)
Tom, on Point Pelee, Canada
Ansel Adams had the Zone System... I'm working on the points system. First I points it here, and then I points it there...