That's up to you to decide. The one you posted I personally think is a decent example but it's not perfect. If the price was right I'd consider it. If you are really after something that is completely original, never polished, and mint condition with box and papers, you'll have to be very patient, constantly searching, prepared to pull the trigger on a price that you may not like, and do it quickly, and probably most importantly... lucky. The more desirable the watch, the less likely you are to find one in flawless condition. Collectors tend to hold on to those ones.
How many people do you know today that buy brand new watches, never wear it and intend to place it in a safe to be sold in 40 years? How many people do you think were doing that 45 years ago? A BNIB collectible vintage watch I'd say is rare.