Shingle name (no pic sorry)

Hi folks...I got a customer that has a roof that was replaced around 1997-98. He is having us install a new roof but he wants shingles like the ones on it now. I should have taken a picture but didnt.

The shingles are standard size 3 tab shingles but they have a black shadow around them. They look like a slateline or something like that, but only they are 3 tabs....not 4 or more.

The black shadow is very distinct about 2" down from bottom of overlaying shingle and in the rain lines.

Any ideas without a picture?

Good call Twill.....It was an O/C Promi......discontinued last year.