Only 13 years experience as a vintage watch dealer and watch repairer. >_>
I've had many watches with the same dial design.
If that's the case, why can I(and most other people who collect and deal in vintage watches) walk around an NAWCC mart room(or any other analogous show with lots of watches for sale) and know the make of a watch without even bending over to look at it?
With the type of watches I deal with, I can usually identify the maker just from things like the numerals, the minute track, and the font of the dial signature. I can spot an Illinois(for example) even when it doesn't even say Illinois on the dial(as in the case of a private label watch).
This is a skill that anyone I know who is serious about vintage/antique watches has. When you walk into a room with quite literally thousands of watches for sale, and you are likely only interested in 1% of them, you need to be able to quickly and accurately sort through them.
With metal-dialed wristwatches, it's also important as knowing what the dial should look like allows you to spot a poorly refinished dial.
Despite your years of experience, all I can say is that if you can't see a difference in dials between different brands, you probably haven't been paying very close attention to the watches you're dealing with.