Before you handle your coins you should:
1. Put on a brand new, clean set of white cotton gloves.
2. Put on a white, full body breathable suit kit (don't use the latex gloves though):
http://www.lowes.com/pd_19107-75227...rs+suit&pl=13. Make sure you wear the nose/mouth mask to avoid any moisture getting near the coins.
4. Put on goggles (you never know!)
5. Put on the Air Conditioning full-blast to remove any humidity from the room.
6. Once the air conditioner is done, shut it off & wait 10 minutes for any dust to settle to the floor.
7. Now you're ready to carefully place the coin into the airtite container using the cotton gloves on your hand.
Provided you don't have kids, animals, or anyone else to intrude into your carefully prepared area then your coin will thank you for all the care you took.
What do you mean nobody else does all that?
Happy April Fool's Day!
In all seriousness, your coin is probably fine. It's been in circulation for so long that much worse probably happened to it and it's still a beauty.
I would only be concerned if it was an MS70 proof coin.