I noticed that ground down to the surface line as well. Which got me to thinking. There are no inlays, so it's not a fretted bass that has had the frets subsequently ground down. Spyders come with side LEDs; and this one has the LED switch and the back plate for the battery compartment. But it doesn't appear to actually have LEDs on the side of the fretboard. However, the pictures are not large and my eyesight is not great. So for me, this bass is a bit of a mystery. However, I don't know much about Spyders; and the listing did say that it was mint. But I'm wondering if perhaps it's not mint and that the original fretboard was pulled.