A real Duncan has a slightly rounder corner on the edges than the fakes. This might not show up in the photo; but, look at the edge of the two and you can see a rounder cut to the real Seymour. If you are looking at a slightly “squarer” corner, you probably have a fake.
Can anyone confirm if they are legitimate?
I contacted the Seymour Duncan customer service, they told me the serial number does not correspond to the pick-up model, so it's a fake. I was suspicious sinc ethe beginning... The owner is going to get it back so everything went well, he had no idea about this. It's a shame because right now there's no TB-6 used around