Since it appears to have a SCSI add-on board, it most likely has had a memory add-on board fitted OR had the memory chips swapped with a small circuit added.
The whole motherboard could also have been swapped with a later 128K/512K capable board.
It's also appears to have had the floppy drive upgraded to an 800K, which means the ROM is probably newer too.
Ultimately, the only way to know if it's the original board is to compare the date codes on the components on the motherboard with the date of the serial number of the case, but even then, it's likely no longer anything like it was when it left the factory.
The logo on the front is intriguing and seems familiar - just can't place it.