I have several Smiths: -2's, -3's, a -4 and so on. But not any "no dashes" that I can recall. Is there a general rule that a "no dash" is aesthetically and monetarily more valuable than one with a dash?
I think a pre - is even better!
As an example, a K38 made in 1950 has more value (if in same good condition) as a model 14-1 (1959), 14-2 (1961), 14-3 (1967) or 14-4 (1977) K38...because they are older and more difficult to find on the market...
Also depends on quantities produced in each modification. Generally, model marked guns w/o dashes do not have as many units out there compared to certain dash models. That being said, there's certain Mxx-1's that are fairly rare. The M28-1 comes to mind of course....