Precise flat band 19.13.150 0.45mm vs 19.13.150 0.55mm chronograph test

Precise flat band 19.13.150 0.45mm vs 19.13.150 0.55mm chronograph test
Precise flat band 19.13.150 0.45mm vs 19.13.150 0.55mm chronograph test
Precise flat band 19.13.150 0.45mm vs 19.13.150 0.55mm chronograph test

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