bruce bailey said:
The Selmer may be the hot one.
Do you really think so? Because I also have one for sale, a Selmer Metal Jazz C* long shank, and I didn't get the impression that they were all that very sought after.
Perhaps the Selmer Metal Jazz Short Shank could (although it is of a difficult application o modern saxex causing more often than not tuning issues) reach high regions if it is one very early ornate one but I personally doubt it.
Lot of the price of a mouthpiece or related items (ligatures too) is due to the legend surrounding them. So before you sell try to find out as much as possible about that particular model and the legend (if any) around it. The unusual shapes and colors help greatly.
Another thing might be availability. The market in Holland is flooded with Stainless steeel Berg Larsen making them rather difficult to sell for anything more than half the normal price, but if you have an early bronze.....with a not so common chamber.......and a grained ebonite biteplate....... Might fetch a bob or two more than the standard models.
Ebay can be a crazyplace and some people might start a bidding war on nothing, so yes, never offer your pieces as a job lot and sell one for one with good pictures and a great story.

Good Luck!