It kind of looks like Dunnett's straight shot-bearing edge just on a wood drum. Pretty neat.I’ve used Gretsch for the most part over a long period so that’s where I’m coming from. I got my first kit back in the mid 70’s. I’ve also got a Craviotto maple kit which was why I was interested in the Diamond series. I first heard a Diamond kit and it was tuned very low and while that’s not my favourite tuning the drums sounded immense, really big and deep. I have mine tuned low mid (to my mind) and they sound very clear and punchy, theres a lot of clarity there.
I’ll send a photo of the bearing edge, it’s a very sharp edge, unlike anything I’ve seen before on a wood drum. I also believe the ply shells are configured in a different way, I think there’s a video with Sam Bacco explaining them. Hope this helps.