The model 600 was made between 1960-1970 it is a .22 caliber pellet pistol, in the condition you describe it is worth in the area of $275. Plus, add 20% for original box and papers.
600-800. A little more if you have the original box, papers, etc.
Need a detailed description of finish, condition, box, papers, all features and markings.
500 USD
400-1000 USD or so
The current condition of the pistol determines the current value. The box and papers add value but no estimate can be given without some statement as to the condition and is it still working. Rate it: Poor, Fair, Good, Very Good or Excellent.
ABOUT $175-$225, depending on EXACT condition, box, papers, etc.
20 to 30k depending on condition and accessories , I own five of them!
For a normal grade in excellent condition (depending on your definition of excellent of course, I'll assume not mint) $400-500. If mint 700-800 w/ box and papers 1,000
About $500 or so. These are the exception to the "low price" norm for derringers. With box and all papers, if in actual excellent condition, possibly more.
Like new Century 39's are going in the $400-$500 range, if they are unfired, and have the original box and papers. If your gun is fired, and has no box, it will probably get about $350.
Depends on condition, if it's been fired and if it includes the box and original papers and the condition of that as well. It could be worth anything from $100 to around $1100 retail if it's unfired without any flaw in the original box that's in mint condition and including the original papers.
400-1000