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Differences Between Omega 8500a, 8500b, 8500g, 8800, 8900 Co-Axial Movements

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When researching the purchase of my Omega Aqua Terra Skyfall (photographed below), one thing that greatly confused me was the caliber numbers and branding surrounding Omega’s 8000 series co-axial movements. Looking back, it seemed that I was not alone; even my local Omega AD was not able to explain the differences between confusing terms like…