An ideal trade offers both parties something new to their collection, perhaps both generating something unique from an unnecessary duplicate. THR is interested in items that could fill a gap in a set – such as – title for nearly similar title, era for nearly similar era, content for nearly similar content, etc. As one example, Dennison’s Bogie Book from 1919 would seem to be a perfect trade for another Bogie Book from the 1910’s. As another example, you have a vintage catalog with Halloween but would prefer a vintage catalog with Christmas. And so on and so forth….