todays auction finds: A motorola qbus cpu ??

Interesting day at the auction. The Data General Aviion 9500+ went for a whopping $17.00. The pallet of ultrasparc's went for $300, (way over my budget), but I walked out with a pdp11/73 in a BA11 case. And the mystery box. A black DEC BA11-m case with a dark camo-green panel and 3 qbus cards, a DRV11-b, a dual qbus card with two 20 pin berg connectors. No I.D. except for the stencil EXTREL 500869 C-81, I have no idea maybe a floppy controller or a serial card. And finally A Quad height Qbus board with a Motorolla MC68000l12 processor and a paper label at the bottom of the board that says: 590139 BUS CPU REV A EXTREL 2MHZ It also has 2 Zilog Z80 chips a Z80B CTC and a Z80 UART So is this a motorola 68K Qbus board?? Can Anybody enlighten me. Any documentation, a quick google search found very little .It probably was part of a instrument that was sold in another lot. I picked this one up as I spotted the ba-11 qbus box. Cheers Tom