So Brian, you've been misleading us, it's not a snatch block at all only a double pulley block. (A snatch block opens up to take the loop of a cable or rope so as you don't have to thread them.)
I think that you may be correct in saying that it is intended for rope. 4 inch diameter pulleys seem a bit small for cable. The radius of the groove will indicate the diameter of rope it was made to handle. If it is relatively large then it's for rope not cable.
David
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Hell no! I'm not that old!
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