I remember a friend who had an STL18 back in 2017. One of the pieces of ivory was not matched perfectly and you were able to see the grain in it, as well as being slightest, slightest shade darker. Your logo could be anywhere from 1995 to the present.
Loved to watch him play. He always looked serious but when you talked to him he was very friendly. Out of all the Taiwanese players, he was my favorite. RIP Chang.
Either tip will miscue if the edge of the tip needs to be scruffed and can't hold chalk, or is not chalked. And the former problems are magnified if your hitting too far out from the center of the cue ball.