Eould anyone be able to tell me the approximate time a coin can be kept in one of these holders befo

No clue from me...they were around in the 60s, but I don't know about before then.

 

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I have quite a bit of 2X2's in mylar covering. Also, I keep them in a Dansco album 7000 with protective slipcases. It also helps that I live in a warm/hot and dry climate in southern Nevada. So far none of my coins have shown any type of environmental damage.

 

I hate those cardboard ones, I had 1/2 dozen nice Morgans ruined with one pin hole in the plastic from a staple and it gets a spot of black oxidation...

 

That is a great idea using oversized 2 X 2,s. A while ago, I ran out of cent 2 X 2's and had a bunch of nickel 2 x 2'x, so I used them for the cents. I liked it so well that I now, always use oversize 2 x 2's. Thanks for the info.

 

i have lots like this been 50 years for some they look the same as when i put them there keep them dry and cool

 

Back in the sixties some 2x2 holders were sticky and did not need staples. The glue on those did tone coins. When I get any I remove the coin and reholder it. As a general rule I put mint state coins in plastic holders and lower grades and tokens in 2x2 cardboard paper holders. One excellent reason to upsize 2x2 holders is so that the rims can be examined for damage by buyers.

 

What does everyone think of the air-tite "do it yourself" slabs ?
Example:

 

No idea. When did slide photography start? I would imagine that was where the idea came from. Coin between two pirces of developed unexposed film stock in the 2X2 slide holder. And the earliest 2X2's that I can remember had square windows, not round ones.