I need an ID on this please

My inlaws bought a house in town that has this peony blooming there. I LOVE it! I would love to order more of them but I have no idea what it is.
I am sure it is somewhat older because this is an older area and the house had a lot of 'heirloom' plants around it. As you can see from the photo, the blooms are nearly 7-8 inches across and it has a double layer of papery textured petals that close up at night and reopen in the morning. There is no fragrance and the color does not seem solid, more sort of streaked or brushed. I would call it a soft pink, more color than pastel, but not rich either.
Any ideas?

http://davesgarden.com/guides/pf/showimage/312064/
You might see if it at all resembles Sea Shell. That is and was a popular cultivar. Sometimes I have seen it with fairly long petals like yours. I wouldn't call it that old, but 1930's for the year of introduction is pretty old. It helps to compare it to a leaf, size of plant, and bloom time also.