CATALOGUES BOTTECCHIA: BOTTECCHIA 1992 (labibleduvelocataloguesbottecchia.blogspot.com)
According to this catalog, thats a 1992 colorway for an SL frameset. That seatpost predates the frameset by a good margin so i was wrong there, but the 105SC parts that are on the bike are definitely period correct , the Sante' brake levers are a few years prior to '92 also
Im sure you could massage it into a functional machine with that eclectic component mix fairly easily -- Shimano plays together (plays with itself?) really nicely but in my eyes , the value is still all in that nice SL frameset -- still put it at $500 at the top end