I did some searching and consulted some charts but can't find when this watch I purchased was made. It's a Seiko SQ with movement SY23, model 8040. Great watch by the way! Does anyone know?

Thanks! But how do you know that?Dial should say Movement (Mov't) Japan
The inside case back should have where it is cased (China/ Korea/ Thailand) if it does not then assume it was all made in japan.
It was also made in 1992 and was one of the last ones that had SQ (Seiko Quartz) on the dial as quartz watches were all around and there was no reason for a fancy badge on the dial anymore