The one that I have has YKK metal zippers. My m65 was made by Golden MFG Co in 1987I can’t agree more. However jackets from 70s with brass zippers are also very well made. I have four M65 jackets and I must say that the one from the 80s is made with less attention to details, especially stiching. But I guess it is a matter of a particular manufacturer rather than a decade. Just avoid plastic zippers, they may be still reliable but look less stylish