It does look very much like a 5V to 12V DC-DC isolation converter to me as well. The markings follow a semi-common standard from what I've seen for those, of InputVoltage OutputVoltage OutputCurrent. Is it possible to do some reverse engineering to find out what supplies it and what it supplies? Is it related to any I/O?
In my, albeit limited, experience unfortunately it can be very hard to track down components like that not made by the bigger electronics companies. All the best with your search though!