just to chime in

for me, NOS does not mean that it's necessarily better - just that it was not used since the time it was made and was sitting as it came from the factory / in a shop window, etc. Some NOS blades actually may have rust / pitting just from sitting in the box - unused.

Now, I have heard that some blades were better from certain periods than later productions - but I think it's brand / model specific

Cheers
Ivo

ps - I think the razor should be ok - don't expect stellar but good quality piece