Besides approaching her with flowers and a nice hat, that is…

…I would like to know how to ID this piece. I’m a bass player, and actually used it with a chorded bass part on a multi-track recording a few years back. Sounded great! Mournful, hollow, dark and beautiful… I’d gotten it in a trade for some stage artwork I’d done for a defunct Ozzy tribute band. I no longer use it however, and I’m considering selling it. I’d be curious to know how one establishes the pedigree, as it were, of such a device?

The little number on the orange-one side, green-the-other-side circuit board is “5150D”, for what it’s worth.

Thanks for your time!

P.S. Pardon the late edit above; of little consequence, but I don’t dig mistakes in my copy!