IWC Portuguese series lW546301 Tourbillon 43mm 98900 movement watch IWC in pursuit of 1:1 perfect reproduction 1 table mirror is double-sided anti-reflective pot cover sapphire mirror 2 movement balance Glucydur@*berIWClium alloy balance The balance wheel arm is equipped with a high-precision fine-tuning cam. The 98900 movement is the only tourbillon on the market that lasts for 7 days. The 4 digits are as smooth and round as the original. The 5 clasp is also the latest snap movement launched by IWC in 2016 Vibration frequency 28800 times of oscillation per hour
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