What Tomato varieties are included in PLU 3423?

[Gardadore]

My husband bought two "Heirloom" tomatoes in the grocery store, one black and one orange. Both were labeled Canada Heirloom PLU 3423. I googled this and found they are part of a Sunset Gourmet Tomato Medley distributed by MCL/4Earth. The tomatoes are beautiful. No other details are given except they are "heirloom". They say they are grown from seeds that are over 50 years old!! I assume they mean that these varieties are very old not that the seeds are literally 50 years old!
Here is the link to the site I was using: http://www.mclproduce.com/product_co...p?cat=7&id=345

I think I will save seeds from the black one. We still have to cut them and taste them for me to decide to save them!

I wish the stores would specify what variety their "heirlooms" are!