Late 30s would be my guess. With the punching in the wrapper (batch/lot?) that would be my guess. There were several brands of soap which had wrapper refunds (American Family in Chicago comes to mind) which would be a precursor to Breeze/Duz/Bonus/Silver Dust. I think that American Family in Chicago (ultimately was a P&G brand) actually had a store which you went to to turn in the wrappers.