Very nice shape and colour, good stem. I see why it stays with you.
Interesting that you note the small size, it makes me wonder if that is a trait from Stoke Poges 'Buttermilk'? I've flowered a seedling of Stoke Pokes 'Buttermilk' x St. Ouen this spring. Lovely shape and colours, but the flower barely exceeded 9 cm Diameter.