Yours is far enough down the line that there would be no collectors value to speak of. A good used blue one goes for about $450 to 500. A good used stainless one goes for a little more; about $550 to 600. Yours doesn't have quite as much interchangeability with modern parts. i.e. if you had to replace either the barrel or the slide, you would actually have to replace both, because of a change in dimensions that took place after yours was made.
...Deeton