Talking about rare, this is an original "F" in oval tip opening fluted Selmer alto sax mouthpiece. It is a great find, they are very rare, I hardly ever seen any and the mouthpiece is in great condition too. It has some little usual wear due to use and little teeth marks as can be noticed. Apart from that it is a wonderful, original "F" 50's fluted Selmer. The ligature and cap shown also included.
Refer to photos for more details. Also visit my other listings for more vintage mouthpieces. Combined shipping is also available for no extra cost. Good Luck!!