By the dropouts it's from 89 to somewhere in the 90's and it looks like a nice all original bike except for the grips because they used foam grips that went all the way to the stem at least on all the ones I know of.
If you get it check the silver sticker above the bottom bracket because the last two numbers will be the year like 94 would be for 1994 and the same goes for the the last two numbers on the stem above the insert line, if the serial number is MOK then it would be a 94 but I don't know about the other years.