Strange lure

Hi folks,

I hope everyone is fine and enjoying the fall bite.

Some time ago I ran into this thing in the local tackle shop. The owner
didn't have a clue what it was, said it came in a batch of spinnerbaits
someone made for him and basically said I can keep it if I think I
have an idea what to do with it. I thanked and promised to let him know if
I catch a fish on it.
It looks like a spinnerbait, but instead of the blade there is a second
hook tied onto the upper arm, point down. I thought I could put a grub or
u-tale worm on this upper hook to create a vibration similar to the one a
spinnerblade would. I tried this from the nearest dock in the river
the same day and had a hit, but got too excited and missed the fish. I think I
pulled the lure out of its mouth before it managed to grab it well.
Unfortunately there was no time to continue the experiments ...

So, does anyone know anything about that thing?

Thanks,
Nikolay