Who here watches [C]: Control: The Money and Soul of Possibility?
I took this screenshot of Kimimaro's Midas card:
And it almost measures out exactly to the size of a real credit card. (on my screen, at least)
ImageActual
Length87mm = 3.43-inches86mm = 3.38-inches
Width55mm = 2.17-inches54mm = 2.13-inches
Diameter45mm = 1.77-inches44.5mm = 1.75-inches*
* would be for actual size, if made