Mondrian is a reference to the paint scheme, inspired by abstract artist Piet Mondrian. Mondrian influenced paint schemes became popular starting in 1984 when the newly established La Vie Claire team of Bernard Hinault adopted a Mondrian style jersey design. In the mid-to late 1980s there were a number of bicycles with Mondrian liveries including but limited to models from Hinault, Look, Rossin, Tommasini and even Nishiki.
I'm not sure if this is a repaint or not. While I haven't seen this particular livery on has to consider that the seller is from Italy and that the European models could be different. Ten Speed Drive, the USA importer and distributor took over painting and decal application on imported Guerrciotti frame starting in late 1985 and even earlier were calling the shots on imported frames for thing like paint schemes and features. I certainly wouldn't rule out the possibility that this is a European model with factory paint.
Having said that, it does appear to be a mid-1980s model with Columbus SL.