I have a decent size coin collection some foriegn but most are of U.S. curency. Lots of different types ranging from 1867 to current dates. I have been collecting for a while and have aquired some from family. I am curious about what key dates to look out for and if I have any key dates, what condition they need to be to have value. I am only familiar with some of the terminology for grading but am by no means knowlegable what they entail. I am interested in selling, if any are of value, want or need to a collector.