I thought COSC testing was done to movements and not to watches.Considering it's a GC and COSC certified, you might be able to trace the COSC serial number to the date it was certified. That doesn't guarentee when the watch was made but it should be close. The GCs haven't been out that many years so the watch isn't ancient.
Read my post again. I said you can trace the COSC serial number but it doesnt guarentee when the watch was made. When the GC came out, there was nearly a doubling of COSC movements from roughly 30,000 movements to 75,000. This would be the oldest the watch would be, maybe 3-4 years old at the most.I thought COSC testing was done to movements and not to watches.