I agree end of lug-lining prob occured end of 1972 based on my bikes ('71 and '74) and CR reports. Pinstriping prob ended by 1970 from examples I've seen. And, I don't think chrome or paint made much difference.
As an aside, I'm glad pinstripers retired; can you imagine doing this job as a lifetime career? Thanks to all that toiled (and toil) to build our beautiful bikes.
Jack Romans
Sacramento, California