It reminded me of the one that I grow - photo. Unfortunately I don't know the name here either, but it's a larger bloom than most. I call it the 'blue' one because it definitely trends toward the blue spectrum. I don't think they are exactly the same, maybe, but it did strike me as similar. Yours might never have had a name anyway. Park Seed used to sell an Achimenes 'mix' of various colors. They also used to offer them by color rather name. You could get white, blue, red and pink, I think. That's been a long time ago now, but at the time Park Seed was widely used as a plant source. Mine came with a name and I still have that purchase list, but can't make it match.
