The "Black Monster" exceeded my expectations fully met. The clock is very robust and has a nice design. I bought as a present two versions (in addition to the SRP307K1 another identical but differently colored SRP311J1): Both watches are for an automatic movement of proceedings precisely: The factory is the deviation of the two clocks 5-9 seconds per day. The readability is as described in other reviews, because of Straken luminosity of the dial very well.