15450 (37mm) vs 15400 (41mm) Pics! - Rolex Forums - Rolex Forum。1st QC: APSF AP ROYAL OAK 15450 37mm from TheOneWatches/Steve : r。QC Royal Oak 15450 Blue Dial - Theonewatches : r/RepTimeQC。Ap Royal oak 15450 ZF from Steve : r/RepTimeQC。お手数の定義みたいなもんですね