If its an ARO BCC, it will have smok engraved on the base. If its a pyrex ARO, the base will be knurled so no engraving. Hubby picked up two ARO BCCs at the local swap meet and it took me forever finding out what they were so I could buy some heads. BTW, they both use the same head which I haven't gotten yet but I do like them better than EVODs as the draw isn't so airy but the heads don't have the resistance engraved on them so you have to have a meter to check them if you change resistances much.
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