single action HK P9

I came across this gun in my dad's junk drawer and am looking for the value, I have looked it up in the blue book but it is not listed there. Maybe someone can help it is a P9 not the P9s and is single action the finish is 90% to 95% and there is two clips.It was built from 1969 to 1978 and they only made 485. I was told this is a rare sim-auto.

Pictures would help a lot, do you have the original box, manual, and other items, all help in value determination.

nevermind... missed part of the facts.

only have gun and one extra clip no manuel or box, every thing is in great working order, I wuill try to post pics this evening