I while back I bought some cheap picture frames at IKEA. Labeled on the front as 10cmx15cm (4"x6"). Standard picture size, right? Well, the centimeter size is exactly correct. Which means the opening is really 3.94" x 5.91". Which, go figure, is smaller than an actual 4"x6" photo. (Except for one photo that fits, and I haven’t figured out what the deal is there yet.)
Anyone in Europe want some picture frames?