RE: OS change to Nickel Plating instead of Chrome?
Hello!
I think it was when they introduced the SF line of ballbearinged engines...sometime in the early eighties.
Sorry! But I'm curious...why do you want to know that??
The OS engines are as good now as they were then...or better...so who cares what they are made of as long as they are good?!
Regards!
Jan K
Sweden