Aug 2010 - pre-G3 Mac motherboards pulled from working systems. 
One entry equals one motherboard, so I have duplicate entries.
see http://www.retrotechnology.com/herbs_stuff/mac.html for details

PowerPC processor

820-0752_a	from 8500/120 chassis??? apparently so.
???		from 8500/120

820-0564-A	8500 (may be an early version)
820-0557-B	8100/80 w/ROM and cache
820-0473-G	8100/80 w/ROM and cache

820-0828-a 6400/180 motherboard, 
		may have cache. 
		with PCI riser board 820-0795-A. 3 pounds shipped weight

		6400/180 motherboard, as above
		6400/180 motherboard, as above
		6400/180 motherboard, as above
		6400/180 motherboard, as above

820-0685-B, probably 5200, with 100Mhz PowerPC processor, and ROM/Cache card 820-0672-A. 

68040 processor

820-0548_B	Performa 636	68LC040/33 socketed
820-0548_B	Performa 636	68LC040/33 socketed

820-0380-A	Centris 650	68040 socketed
820-0380-A	Quadra 800	68040 socketed
820-0380-04	Quadra 800	68040 socketed
820-0382-A  Quadra 840 AV - OUT none in stock

820-0453-03	Quadra 660	no proc
820-0453-03	Quadra 660 AV	68040/25 socketed

820-0377-A	Centris/Quadra 610	68040/25 socketed
820-0377-A	Centris/Quadra 610	68040/25 socketed
820-0377-A	Centris/Quadra 610	68LC040/20 socketed
820-0377-A	Centris/Quadra 610	68LC040/20 socketed
820-0377-A	Centris/Quadra 610	68LC040/20 socketed