See no reason it couldn’t be seckle but seckle grow in clusters like this.
Seckel Pear - #42 by clarkinks
See how the calyx end sticks out on your pear little more than others that’s just like a seckle. They also are small. Most pears calyx end is recessed in more like ayers as shown below as an example
Then you need to observe this year and see if they grow in clusters like seckle.
You took a picture of your pear with a ruler and here is the size of seckle. Way I figure it’s about the same size.
