For me, it's whatever you like. It's a limited DCA park-only item; however, they aren't too difficult to come by either. I would say certainly any other in-park item such as a red penny press, wanted poster, or magic mirror would be a fair trade. Items other than park items would also make a fair trade, but it would be in the eyes of the trader. If you are both happy and get what you want, then it's a good trade.
I recently trade an Adventureland retro pin for a desk and stool. The pin is from a now retired quest and the person who traded me said that the desk quest is now retired too but I don't know if that's true. Anyone else know for sure?