It could be, depending on the type of Carborundum, but I wouldn't use it. Some people use them, but they are a vintage bonded abrasive which with time may or may not be very good anymore. The reason is the bonding is often times not as it was originally intended and could either be too aggressive and/or inconsistent to provide a quality edge. Vintage natural honing stones are a different animal compared to Vintage synthetic/bonded honing stones. I've used vintage barber hones and they do okay, though some people find that certain barber hones are amazing.
Good luck Jimmy!