No early than 1990, In fact that is my guess. The serial number doesn't start with 0? Are you missing a digit? It has the smooth mitered stays without caps. I have never seen a Marinoni with that prior to 1991, but I have been surprised before and the DT shifters point to late pre 1991 so yeah I'mna go with 1990. I had a 1989 with almost the exact same paint job...