Noob - need help identifying newly acquired slab...

So the top case corner triangle does NOT say color.  The bottom says N1100.

But the mainboard only has 4 x 72-pin SIMM slots.  Also the ROM is 1992, Rev 3.3 v74 (I have 2 x mono slabs that have v65 (??) ROMs).

The CPU is 25mhz.

Is this a color board put into a mono case ?

Thanks.

I might be answering my own question here...

http://www.museplan.com/projects/next-mac-faq/NeXT-FAQ.txt

According to that, there are mono slabs that have 4 x 72-pin ?  So if that's the case here - this is just a newer rev mainboard ?

Yes, you have a turbo chipset but a slower cpu. If its socketed (unlikely) you can replace with a 33mhz and move a resistor to use the faster speed.