
Hoeing the Fields (pitting potatoes), by William Marshall Brown, c1911
Photo Credit: East Lothian Museums http://www.flickr.com/photos/eastlothian/
Not quite the 57, but one more than the 21 varieties that inspired Heinz, and impressive for a High Street in remote East Lothian.
Today I counted 13, entirely Scottish grown. Five of them were local.
Hard to beat.