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NOS anything is a good idea..... I am guessin you and your wife also use utensils. They are metal and they are "washed". Even at home they are not 100 sanitized. There are some great products out...

A source for NOS straight razors?
A lot the times it's the luck of the draw.
I don't think there are too many vendors that are selling many vintage NOS SRs.
They are around....you got to dig deep...