Hi Marco. We have three "Indiana" patterns in the database, by Allerton, Wedgwood (not THE Wedgwood but a lesser known potter), and an unknown maker. All of them different from your pattern. If you have been able to find an attribution to Pratt you're doing better than I have, I've looked in several books and online and not found anything. Yes, this does appear to be a dessert service. Wish I could tell you more; if more information does come up will let you know.