I think its a Intel Premiere PCI ED (Batman) OEM board but its not exactly quite the same. RTC is uout of place
It has an AT keyboard conector but PS/2 Keyboard and Mouse port pad on the circuit board.
PBA 617520-001
AA 615989-009
https://www.elhvb.com/mboards/intel/index.html
http://www.motherboards.org/forums/viewtopic.php?t=21675
BIOS
BIOS 617325-001 (1.00.03.AF1)
Got a good old SX835 C1 stepping Pentium 60, so should have FDIV bug
I also have a D1 Stepped PCPU5V60 without