From Tatiana’s TOMATObase:
- French Heirloom. Some sources indicate that it is from Switzerland, probably because Bern (or Berne, to use the French spelling) is the capital city of Switzerland. There is an apple variety from Switzerland called "Rose de Berne", and this variety is known in France. Some may speculate that this is where the tomato name came from, as it resembles the apple in shape and color.
- Nine commercial sources were noted for 2004 in the Garden Seed Inventory 6th edition.
Some of this strain was given to The Seed Ambassadors Project by Ulla Grall of Bio-Saatgut in Germany. Here is an interesting article about Ulla Grall and her work.