THE JAPANESE WATCH DISCUSSION FORUM
I remember seeing 6309s at the PX for 130$ at the PX in 1986. And still some in 1989 but at 150$.
By 1990 I did not see any. But the 7002s were showing up, for sure by 1991 and were $150.
I don’t know what timelines others say in their countries, other states or OCONUS PXs, civilian stores...