I respectfully disagree.
When Hensley & Gibbs were making moulds in the 40's 50's and 60's and maybe even the 70's, THAT was the golden age. I don't think anyone has come close to the tolerances and quality of those moulds. I own a fair number of them and I have to say the quality is always top notch.
They were master machinists. They didn't have the CNC machines and did it the old fashioned way on Bridgeport lathes - by hand and micrometer.