The physical equivalent of a Bitcoin is a Casascius Coin. Bitcoins can be purchased in quantities of 1, 10, 25, 100, and even 1000. The availability of these coins for market transactions was the primary consideration in their design. Here, “market transactions” refer to buying and selling in person.
This coin is available in a variety of formats, designs, and shapes. One of the earliest actual bitcoins is this one.