you're definitely going to need to get the caseback off to tell for sure. You will also want to get the movement number and make sure it aligns with the authorities on the matter for the reference. if the tension ring is silver, then it's likely a 105.002. If it's black, then a 105.003 -- but that's not a definitive way to tell as the crystals (which the tension ring is attached to) are compatible with both references.
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