Voutilainen Caliber 28

Caliber 28 is a manual-winding movement launched by Voutilainen in 2011 as the manufacturer's first fully in-house caliber. It features a patented double-wheel direct impulse escapement and pairs a Grossmann inner balance spring with a Philips outer one. The movement provides a 50-hour power reserve and remains in production, underpinning the Vingt-8 models.