202 block is a late transit block, the number on the end I.E the 2 in this case dictates 1992 in the same way the 0 on the end of a 200 block means introduced in 1990 although this was stronger than the legacy blocks I.E 205 (Excluding YBD 205). People do use them as they are more avaliable and cheaper than the rest I think they have less core plug holes than the 205 though and you can't long stud them.

Martin