I am hoping to identify this quince. Unique shape- I think? From one green world about 15 years ago. Lost tags. Think it started with a k and leaning toward kuganskaya but not sure. Was a popular russian orchard variety.
Kuganskaya is a variety they sell. That one looks more like Wolgogradskaya though…
My Pineapple quince tree produces fruit of various shapes, and that is one of them.
If your quince are nearly all that shape, they may be a different variety than Pineapple.
They do mostly have that shape