Interesting, after I read this I went and checked to make sure I am not going senile.. This is one tuft out of the last 100 pack I bought I want to say within the last two years. Yep, sure enough it is laser etched.. Again, I do not know if the OP received fake or if Gillette changed how they are marking them. My understanding is that is more cost efficient to laser etch vs. using Ink. I'm sure there is a B&B member that will shed some light on this mystery..All of my platinums are in ink.
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They're not fake. I have Gillette Platinum blades that are laser etched as well. The only difference is that on mine they switched to a light blue package with a hanger on one side. Also, the counterfeit blades made by the Chinese, as far as my understanding goes, never have laser etched/engraved inscriptions as the laser machinery required is pretty expensive. It's PPI's way to protect their property by making it much harder to copy.
Given the fact that the new blades in your case still came in dark blue packaging instead of the light blue one leads me to believe they were either made when the transition was taken place or maybe they had leftover packaging from the old ones, as they've been making them for years and years.
In regards to the shave quality they should be pretty much the same as the old ones. Maybe you just got a dud blade or pack.
I have both the old ink ones and the new ones. I can snap some pictures later, if that helps
Today I learned.The Gillette Platinum Dark Blue did not switch to Light Blue packaging, they are two different products. I made an in depth post regarding it here.