It would seem that these are at least 10 years old. If they are indeed platinum chrome, they might be Israel Red or USA made plats? I guess I will know their quality soon enough.Those can be found under a myriad of store labels. From Personna, now Accutec, made in Verona VA for sure. I shaved with them for more years than I can count, usually puchased in a big grocery store or drugstore and featuring the chain's branding.
They worked for me, but I wasn't fussy and just bought the least expensive blades on display.
I don't use them these days, but I am still a platinum believer.