Here is the next comparison of old vs new PPI (Russia) blades. PERMA-SHARP. This model has been renamed twice. The first were Perma-Sharp Super. Then they renamed them to Prema-Sharp Stainless and now they are only Perma-Sharp.
On the left is a pack of double wrapped blades, bought in 2010. On the right the latest I could find. Manufactured 01/22. Everything used was the same except for the blade. Even the aftershave used. These blades shave the same.
Stay tuned for the last comparison. Pre-2010 Iridium -Super vs the latest ones.