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The new Oursin comes equipped with link the automatic-winding Caliber GG-005 which is based on the Zenith Elite a high-performance movement from the Le Locle manufacture de la haute horlogerie. This iteration of the Elite has been customized for the Oursin with a redesigned 18k rotor reshaped link in the form of an octagon. The Elite was also launched around the same time as the inaugural link Oursin in 1994.

Spec-wise the watches are identical to the link SPB143 and the SPB153. They're powered by the 6R35 a caliber that's broadly used across Seiko's entire range and has settled in as a tried and true mid-tier movement. Both feature a stainless case the SPB239 at 40.5mm and the SPB237 at 42.7mm they're both 13.2mm thick with a water resistance rating of 200m. Everything you'd expect like a link screw-down crown and caseback and a sapphire link crystal are present.