According to Seiko’s website, the accuracy spec of the 4R35 movement is +45 sec ~ -35 sec per day.
I had a specimen of the SBDY003 with me for review and on returning the watch, I put it on a timegrapher just to find out how accurate it is.
Below is the reading I got on the timegrapher with dial facing up. The watch is performing at -5 sec per day at this position.
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