What To Do With Damaged Lincoln 1914-D And 1931-S?

There's really nothing you can do to save these coins . The 14-D is toast ,the 31-S has corrosion spots and some other damage . When a copper coin starts corroding as badly as your 31-S , it's a goner .

Acetone on the 14-D and see how it turns out. It's still a 14-D and will fill a hole in a circulated set.

The Verdi-Care will likely remove the green verdigris in "In God We Trust" and probably clean up the reverse as well. It was developed by a forum member and Lincoln expert and has worked well on a few of my coins.

What to do with them? I mean you could give them to me. I'll take those off your hands!

I agree with verdicare on the 31S. You might be able to save it, or at least not allow it to get worse.

Just hold on to them as is an celebrate they were your Grandfather's coins. Not all coins need to look bright and shiny, especially ones your Grandfather owned.

First, the good news, from the minimal information given, the coins both appear to be genuine. :)

DON'T TRY ANYTHING ON THESE COINS. These are key date coins and you'll only make things worse.

If you truly want to save them, leave the conservation to an expert or a professional (PCGS/NGC). The #1 mistake made by new collectors is to completely ruin their coins by attempting to "clean them up a little". This is ESPECIALLY CRITICAL with key date coins. A heavily cleaned coin is worth LESS to me than a corroded one....just MHO.

Keep the coins or sell them, it doesn't matter..... I would rinse them with distilled water, then acetone to dry them and go right into Airtite holders. This will "freeze" the corrosion process pretty well until you figure out a rational plan for conservation or to just leave them as is. GOOD LUCK!