Judging by the reorder number and the shape of the arrows on the blades, I think these are P74s. If I didn't already have too many blades, I would grab the box of 100.
https://www.ebay.com/itm/VINTAGE-ASR-PER...Swq~xfvDmY
https://www.ebay.com/itm/VINTAGE-ASR-PER...Sw5uNfvDW1
https://www.ebay.com/itm/VINTAGE-ASR-PER...Swq~xfvDmY
https://www.ebay.com/itm/VINTAGE-ASR-PER...Sw5uNfvDW1
John