Refurbished VIC-64?

Ok, seems like a good time to ask about this, since we're on the 80's 8-bit micro topic. I have a strange machine, and I'm not sure what to make of it. When I bought it (for $2.95) I thought it was a VIC-20, because it is a VIC-20 case. Then I noticed that the expansion connector was not the normal (wide) VIC-20 type, but a C-64 style slot. I also noticed that there was some neat machine work in the expansion port to accomodate the different connector. I opened it up, to discover a complete C-64 motherboard installed, and a big hot-stamped "REFURBISHED" in the bottom of the case (external). The machine runs, and it's a C-64 for sure. Any idea who might have been "refurbishing" VIC-20's into C-64s? Doesn't make a whole lot of sense to me... -- Bill Layer