I mainly collect Pre 1945 and moreso pre 1900 foreign coins. Is there a way to sort the coins I am looking at on another persons collection on Numista by date so I do not have to scroll through the much more plentiful modern coins collectors have?
You can't sort this list. What you could do is create a "wish" with something like 1800-1945 as a Gregorian date, then when you look at a swaplist you can choose to only display coins that you wish.