I have a handful of drums that might even be one of a kind - I've sure not seen one like any of them in all my years of drumbrowsing. So they might be considered 'rare'. But they are all 'less sought after' drums, a Swiss Imperial brand, a Jedson, a Joseph Rogers & sons Daisy Brand, a John Grey Orchestral. I really like collecting these cause #1, I can afford to buy them in the 1st place, as opposed to a much more valuable Black Beauty, or vintage Leedy, or whatever. But I also like the character of each, as well as it's place in drum history, like the Jedson being predescessor to the Leedy drums. I find it interesting, seeing the 'in between' drums made by some historic notorious drumbuilders. I also like having a handful of drums nobody else has. And I also like taking these castaways & restoring inserting them back into existence.
Although, my point is that though these might be considered 'rare' or one of a kind, they wouldn't really sell for much because of it either.