My personal opinion is that year 1985 was the end of top quality Pythons coming out of Colt. That is the year they went on strike. Strike lasted 4-5 years.This table ends at 1985, and more were produced after that time.
Just with a quick cut & paste on to a spreadsheet, I tallied those numbers.
466,497. Good grief. That, folks, is an absolute BUTTLOAD of revolvers. The Python has an awful lot going for it, but exclusivity and rarity (in general) is simply NOT it.
By the time the strike ended all the old smith/craftsmen were gone. So again in my opinion quality went down the tubes after the strike.