Welcome to the Forum, Brown1212....
It's becoming very uncommon to see a no-dash Mod. 66 with all the original extras. Box, paperwork, tools, etc... Be sure to keep them all intact with the gun...
Viewing the picture you provided there are a few things that will have an impact on its value.
The majority of the early no-dash 66's had stainless rear sights without a red ramp which enhances their value today. Many were modified because some had a problem with the sight picture in bright light. Many were changed, mainly by law enforcement agencies, to a black rear sight assembly with a red-ramp installed on the front blade. It would be beneficial to have a serial number to consider an approximate date of manufacturer.
Your 66 does possess a trigger stop which was also frequently removed on many of the earlier guns. The black rear sight and the red-ramp became standard on the 66-1 guns. The trigger stop was eliminated on those later guns.
There are many "gray areas" when dating minor changes for all S&W firearms. The Mod.66 is certainly no exception.
I don't quote value for any firearm anymore sight unseen. There are just too many variables to provide an accurate quote. I would say if yours 66 is completely factory original it would be at the top end of the value range with everything it includes.
Below are pictures of a NIB, factory original 66 no-dash in the very early 2K range...
Hope this helps a bit....