I had always assumed due to the packaging, the the blue pack St. Petersburg "Platinum" blades were close relatives of the Silver Blue...
But at least for me they're a whole different blade! My first "Swede" is still going strong at a week worth of shaves, which is exceptional, considering that I usually get only 3-4 good shaves out of a DE blade (Personna 74*s excepted). Not to mention that it's among the smoothest blades I've used *and* gives closeness that's right up there with Feathers and 74*s.
I'll keep shaving with this blade until it feels harsh for at least two days in a row, but at this point it seems to be second only to the vintage Personnas in longevity, which is great, since it would be nice to have more than one long-life blade option!
But at least for me they're a whole different blade! My first "Swede" is still going strong at a week worth of shaves, which is exceptional, considering that I usually get only 3-4 good shaves out of a DE blade (Personna 74*s excepted). Not to mention that it's among the smoothest blades I've used *and* gives closeness that's right up there with Feathers and 74*s.
I'll keep shaving with this blade until it feels harsh for at least two days in a row, but at this point it seems to be second only to the vintage Personnas in longevity, which is great, since it would be nice to have more than one long-life blade option!