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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]].

Giacomazzi worked mainly in contract manufacturing, and no pens bearing its name can be found at least until the 1950s. The only trademark that is definitely its own is [[Olimpica]] for which there is a registration in [[1944]] by Dino Giacomazzi  ({{Marchio|90736}}), other quality brands which production is attributed to Giacomazzi are [[Point red]] (which however was an Ubaldo Massari of [[Mastilo]] trademark), [[Sirium]] and [[Sirium Extra]].<ref>but for the latter there is an evidence: on a pen with this brand was found (see [[:File:SiriumExtra-Arrowclip-Piston-Inscr.jpg|this photo]]) a reference to the utility model {{Modello|22111}} registered by the "Fratelli Giacomazzi".</ref>