Here's what I found on the "Matsu" Apple:

"(Apples - Crispin) Crispin, or Matsu, apples are among the larger of the eating apples. As the name implies, they are crisp and slightly tart. Aged Crispin apples have a tendency to get slightly "mealy" and somewhat sweeter. It is best to buy these apples very soon after harvesting in the autumn."

There's a photo at the following site, along with the above description ... and some religious stuff..?

http://www.all-creatures.org/recipes/i- ... ispin.html

Here's what I found on the "Mutsu" Apple:

"The Mutsu Apple has a moderately sweet flavor with firm, juicy and cramy white flesh. Its skin color is a yellowish green with an orange blush. The Mutsu apple is also known as Crispin. This apple is vigorous, fairly early, and the fruit is large and oblong shaped. It is excellent for fresh eating, sauces, pies, and baking. This apple stores and keeps well."

That's from the following site, and look -- It's the same Photo!

http://www.naturehills.com/new/product/ ... name=Mutsu

It looks to me like a variation in the name of a Japanese Apple variety ... to the point of giving "our own" name: "Crispin" --- Good question though ~