S C4484 - built at the beginning of 1991; if you can check the paper sticker on the steering tube you will find there some interesting information (including the size of the frame); lack of X and digit among the markings occurred in "'serial" frames, among "custom"/"profi" frames very often. If you will be able to definitely add photos.
?8TTB D5583 - built in early 1993 Century TSX.