Red LMC

Believe it or not even with the ridiculously high mintages it took 20 years to find an MS-70 LMC .

Here is the article from PCGS

http://www.pcgs.com/articles/articl...iverseid=313

given that record its worth the search for the second MS-70

but on the other hand to keep all of the AU cents I'm not so sure .

But a set that stands above average 66 and above then you would have something that will gain in value and it won't take a hundred years to do it .

PCGS is pretty conservative in grading coins. So, if PCGS says it's MS70, then it really is MS70.

Ouch!

Meanwhile back to your question. Yes it is well worth while to collect those. If nothing else they will always look pretty neat in an album. And that too depends on which one. The Whitman is Blue, The Dansco is sort of light Brown, I think Littleton is Green but not sure. My way of looking at it is such a set as you mention would stand out more in anything except Brownish since the coins will not stand out so much. Many will always answer with a monitary gain aspect but collecting coins is supposed to be fun so who cares what they are worth?
I also collect flashlights and I know they are just not worth a lot of money but they are to me a sort of bright idea for a collection.
I've got other collections that also are really not worth collecting monitarily but they are fun anyway.

Since they are 99% zinc, they still have a copper plating and copper may tend to get carbon flecking or spots.

The short answer is no. At least not that I have ever seen.

Lighthouse?

Okay, kind of looks like the airtites. Those are actually pretty secure. Keep in mind, when you put a coin in there for long term storage, you are locking the coin in there with the surrounding air. This may sound silly, but I hold my breath and don't talk, cough, or sneeze while doing this. This will trap moisture in there with the coin. As far as not forming carbon spots, no guarantee.