I have had my rubber armored 10x42 Zeiss for over 25 years, they are still working as well. I have scanned many hours from deer stands with them without any issues.
I bought a used Nikon 7X50 back in the 60s. It is still one of the sharpest ones I have ever looked through. I think it is still being made as the Prostar model. It has the range finder and individual focus.
I read somewhere that the Australian Navy used them in the 60s and paid something like $1500.00 apiece for them.