Yeah, there's no such thing as a, "Dumble".
If Dumble didn't make or rebuild it for you, specifically, it's not YOUR Dumble, it will always be the amp Dumble built for the artist he built it for.
There are many amps built by Alexander Dumble and they're all different.
That's no judgement on the quality of this particular pedal. It might be great.
And Mr. Dumble built some pedals too...