An outdated chipset with 8-bit interface mounted on a 16-bit board. Benchmarks also point out that the 16-bit version performs identical to the 8-bit version (actually the 8-bit seems to be one fraction of a millisecond faster).
Being not too expensive and having a fair compatibility, the OAK card id it's job. In the 90'ies I would consider it acceptable although it falls behind on the Paradise PVGA1A-JK graphic cards. All the 037C cards have 256KB RAM because the chip can't address more. Due the small amount of RAM it can't run SVGA resolutions, but the chip would be too slow for that anyway.
The PCB reads 59-6651-0005A in the middle and it has an even and odd BIOS with OAK OTIVGA stickers on them.