It would actually be more accurate to say that NASDS is now called SSI.I am pretty sure that the NASDS OW card is their version of AOW. I believe they were bought by SSI which is now Mares. I don't know if agencies now will accept it as AOW as it may be considered comparable to the PADI "scuba diver" and the PADI OW diver. I could be wrong though.
The two agencies merged some years ago, with the owner of NASDS (Doug McNeese) becoming part of the SSI management. He then bought out the others. So the owner of SSI, Doug McNeese, was the owner of NASDS previously, and he has brought most of the NASDS policies into SSI. Even if the NASDS records of your particular certification may be lost, SSI will be thoroughly familiar with their meaning and will be able to explain them to you.