Not sure no luck so far dating but believe at least 15+ year range (maybe longer) just based on the label style and the type of print on the blade envelope. I used one for a first shave yesterday with a NEW SC (3 day growth) and it's extremely smooth. No blade feel at all WTG. I'd compare it with an Astra, current day Med Prep or a "Spoiler". Tomorrow will use for shave #2 in a 06 Single Ring.Any indication of how old they are? I'm interested in the comparison with the new blade.