Be aware that the Speedsonic uses the same chronometer solution as the Speedmaster Reduced, that is to say it uses a DD module on top of a normal hummer movement. This makes servicing rather tricky and your options are very limited, even more so than with the Reduced in fact since you have the double whammy of hummer and DD, both are a PITA. Unless it is working well, I'd be very wary. It sounds cheap but maybe so for a reason.