This is an original 1993 Bally Twilight Zone playfield(s).  Bally had three main suppliers for TZ playfields in 1993.  Some of them were made by TAG (Thomas A Grant), about a third of them were made by LS (Linc Smith) and SP (Sun Process) made the remaining inventory.  This is a Sun Process made main playfield.  The Sun Process playfields are the desirable ones with deeper colors, especially in the reds.   No decals or stickers were used in this playfield restoration.