Colt Diamondback

I have a colt diamondback 38 cal in nickle finish, i have the box and a set of pacmeyer grips with the colt emblem on them. when did colt stop production and what is the approx. value ? the gun is in like new condition

the colt diamondback model was produced between 1966 thru 1986 and current book values range from around 500exc-650NIB and prices seem to be on the rise ,,collectors seem to be always looking for examples with the original boxes and will pay the higher preimums when they find them,,gunshops would proably offer in the 300-350 range mabey a little more since with box and paperwork,,
bigcurt