Yes Or No? 1990 Eisenhower Commemorative

does the toning on that negatively affect the value?

it's brownish. The '87 "We the People" coin doesn't have any.

i'll go take another look at it today and get back to you.

Both coins are proofs

A few things to consider:

1) Many modern US commemorative coins do develop a bit of toning over time. As jbuck noted, their capsules are not air tight and so their storage environment can impact them. So, the coin you are considering is certainly not the only one out there with some level of toning.

2) A bigger problem with these coins is that many proof coins develop a milky cloudiness on their surfaces which many collectors do not like. Such coins would be tougher to sell vs. a completely clear coin or one with minor toning (especially if the toning adds color to the coin).

3) The coin store's asking price of $20 is at the low end of the price range for these coins. As they contain about $16 in silver melt value (at today's spot price) there is very little downside risk in purchasing the coin.

And remember, whether the coin is fully brilliant or slightly toned, most dealers are going to base their buy price for a common modern US commem on the spot price of silver. Sad, but true! So, again, you have very little risk in purchasing the toned coin.

All that said, only buy the coin if you find it attractive and would enjoy having it in your collection. Don't view it as an investment that will yield a big profit in the future.

Not really, they are both common coins within the series.

so I decided to get a 1987 U.S. Constitution silver dollar. turns out it also has visible toning around the ring of the obverse side and somewhat on the reverse as well. $20 out the door.

it seems like a great deal in ogp to me. for both the 1990 ike and the '87 constitution