It is smaller than 15400 and 15500, but I do not think people will choose the 15450, I still like the larger one 15400. In our market, ZF and APS make the replicas of Royal Oak 15450, which factory makes the best? I think both have the same quality, APS factory offers the movement to ZF, ZF just assembled every watch part, but they sell the watch at a higher price than APS. Actually I always recommend ZF Royal Oak 15400 and 15500 to my clients, they are very satisfied and never have complaints, so if you are not concern about the price, just go with ZF.