The Felsa 297 watch movement is a manual wind mechanical movement that was likely produced around the period of 1960. The escapement and winding parts of this movement are sourced from Helvetia, while further details regarding any differences between the Felsa 297 and the 110 are unknown. It is notable that while only one variant of this caliber is known from Helvetia, several variants are known from Cortebert, suggesting the possibility of a modified version exclusively made for Dugena.