PHILADELPHIA — It looks like the U.S. Mint has struck again — or actually, not struck again.

Some of the new dollar coins featuring John Adams are missing edge inscriptions including "In God We Trust," according to the Professional Coin Grading Service, a Newport Beach, Calif.-based rare coin authentication company.

The company said hundreds of Adams dollar coins have been found without the edge lettering, repeating a mistake the U.S. Mint had aimed to fix after it marred an earlier batch of presidential dollars.

After those "godless dollars" were discovered, the Mint pledged to more closely monitor the striking process.

But a Detroit collector received smooth-edged Adams dollars in sealed containers from the Philadelphia Mint. There also are reports of the opposite problem — Adams coins with edge lettering that has been double-struck, said Ron Guth, president of Professional Coin Grading Service.

"It's too early to put a final price tag on the collector value of Adams presidential dollar errors because no one knows how many others will turn up," Guth said in a statement.

So far, about 500 coins without the edge lettering have been found, Guth said.