Working from what appears to be the card's Mac Address printed on the ROM (00-40-88-00-20-C3),
it appears to be made by Mobius Technologies, inc. (Model MD042)
So far that's all I know.
EDIT 1:
It does appear that it may be a TTL or RGB video card (as well as ethernet). A manual would really help with the jumper settings which seem to affect the pinouts of the video connector. You might require a suitable monitor to make use of it and at a guess the video driver listed here under 'Mobius':
Sometimes I wish people who junk old machines would check the hard drive (if working of course) to see what unique drivers are installed.
EDIT 2:
However, according to "
Build_Your_Own_Macintosh_and_Save_a_Bundle_1992"
"
Mobius and Lapis share a common heritage from Beck Tech. Mobius passed on TTL compatibility and opted for more powerful combination accelerator/video card /monitor packages for midrange Macin-tosh logic boards. Lapis went for the broader monitor attachment market, licensing, and TTL."
Mobius used to sell CPU accelerator and video cards bundled with their OWN monitors, so it's possible that these cards only work with their own fixed resolution monitors.