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

Originally published at: https://watchcharts.com/wp/2018/06/22/differences-between-omega-8500a-8500b-8500g-8800-8900-co-axial-movements/

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…