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Giacomazzi worked mainly in manufacturing for third parties, and branded pens in his name are unknown at least until the '50s. The only brand they definitely own is the [[Olimpica]] for which there is a record in 1944 by Dino Giacomazzi ({{Marchio|90736}}), other brands with quality production attributed to Giacomazzi are [[Point red]] (which, however, was an Ubaldo Massari of [[Mastilo]] trademark), [[Sirium]] and [[Sirium Extra]].