I don't see any reason to believe it's an OEM board. They usually stamp their logo somewhere on the board. They also tend to use Phoenix BIOS. Using MR-BIOS would be highly unusual. In my opinion, it's just a typical no-name 386 motherboard, and you'll probably never find out who made it.
Fortunately, there are few jumpers to figure out and you have a good chipset and 256kb cache.

Also, although we already have MR-BIOS for this chipset, maybe you could dump yours anyway incase it's a different version.

The motherboard model is a 60-4070B from 1993. Likely a generic/clone manufacturer, and it doesn't look OEM as stated above.

thank you guys for replying. My friend got it from a school, when they were upgrading the pc's a long time ago, that is why i thought it was oem, i remove that now. i had the leaking battery removed and cleaned it a little bit. later i can test the board and if not already here i dump the bios here.

just like 35-xxxx-xx directly points to PcPartner/Vtech I seem to remember a similar thing is true for 60-xxxx. I'll have to dig deep as I haven't been ID-ing boards for some 8-10 years. Now what was it...

I'm glad you dumped the BIOS. Think this one is older than the one we currently have on file. It might come in handy with baords that fail to work with the later version.

We have jumper settings now:
Help identifying dead unknown 386DX motherboard with Mr. BIOS
listed here:
http://www.win3x.org/uh19/motherboard/show/5409

We have another board with 60-4077A marking that turns out to be PCChips. M351 is a model number they may have used, as we have M321, M396F etc. The unusual thing is the MR Bios but that may be an aftermarket upgrade.