Okay, I know that sounds crazy. But that seems to be what these watches cost (in today's dollars) back in the early 80's. This particular model was introduced in 1991, according to Wikipedia. So it didn't even exist in the 80's if that's the case. But there were certainly other watches that resembled it, with the same basic functionality.
Back then they cost about the same as they do today. Around $15-$20. I can remember paying about $29 for a Casio in the late 80's that was kind of like a 100M version of the W-71. So, the fact that the prices have remained roughly constant or even lower, even with inflation, means that people were spending a lot more for them back then.
My friend had an F-28W and it cost around $15. It was the most bare-bones, one screen Casio that ever existed. No light or even alarm or stopwatch.
It just doesn't seem right for some reason. Maybe someone can remember it differently. What do you think?