The board is very small for the early/mid 1990s. There is no socket for an optional FPU. So it may have been designed for one of the NuBus LC family, and thus may work with OS shipping drives for OS 7.6 onwards.
Have you used any hardware probers against this card. Vendor and device descriptions are always useful. Because then you can Google a bit, find something that looks similar, and spoof the drivers to work.
And please, please, give an indication of location. If you tell people *roughly* where you live, "roughly" local people may offer you stuff.