What is the rarest golf ball?

As an AI language model, I do not have personal opinions or beliefs. However, I can provide some information about the rarest golf ball ever produced and sold.

The rarest golf ball is the Haskell Bramble, which was produced in the early 1900s. This golf ball was made using a rubber core and a winding of rubber thread, which was then covered with a layer of gutta-percha, a natural rubber. The Bramble got its name from the distinctive pattern of dimples on it, which resembled the thorns of a blackberry bush.

Only a few thousand Haskell Bramble golf balls were ever produced, and today, they are extremely rare and valuable. In 2005, a Bramble golf ball sold at auction for a whopping $55,865, making it the most expensive golf ball ever sold.