Gronefeld 1941 Principia Automatic Steel Turquoise Dial 2021 UNWORN

More about 1941 Principia Automatic Steel Turquoise Dial 2021 UNWORN

This is a stainless-steel Gronefeld Automatic 1941 Principia. It includes a green/blue python strap with a stainless-steel tang buckle and scratch resistant sapphire crystals. It has a signed cone-shaped pull out winding crown and there is an exhibition sapphire display crystal case back secured with 8 screws and engraved with "GRONEFELD," and a serial number. The 39.5mm diameter solid round two-body case, sculptural lugs, and stepped concave bezel, are polished. The two-tier dial is matte turquoise-colored sterling silver with a recessed center and applied trapezoidal hour markers surrounded by a blue perimeter minute scale. It includes blued dagger hour and minute hands and there is a recessed small constant running seconds subsidiary dial at the 6 o'clock position with blue Arabic numerals, markers, and a blued indicator hand. It's water resistant to 30 meters/100 feet, it has a 56-hour power reserve at full winding, and the 10.5mm thick case, dial, and movement are all signed. This Gronefeld Automatic 1941 Principia has a mechanical automatic self-winding Gronefeld caliber 1941 Principia movement. It's rhodium plated with hand-beveled bridged and jewels set in gold chatons. It's constructed with 31 jewels, an anti-shock system, and a 22k red gold monobloc rotor engraved by hand that turns on a ceramic ball bearing. It includes a balance wheel with white gold timing screws, a free-sprung hairspring, and a monometallic balance that's adjusted for isochronism, temperature, and 6 positions. Each hand-made movement has a gold plate with an engraved serial, and the mechanism oscillates at a frequency of 21,600 vph (3Hz). The Gronefeld Automatic 1941 Principia was introduced in 2018.

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