When harvested early, they are good for boiling.
When harvested later, they are good for French Fries (aka chips in the UK.)
Not good for baking.
Bismark Potatoes were developed in 1928 in Tasmania as a strain of Prince Bismarck potatoes, which had been introduced into Tasmania in 1880. Was called at first “Silverskin Bismarck”, then just Bismarck.