This is what I have had for a few years:
I found these on E-bay as mismatched stirrups - I do not believe the owner realized what she had was 2, a Mother / Daughter sized set of sidesaddle breakaway stirrups!
This one was my first - and a gift from a sidesaddle mentor! It means the most to me. As a return of her kindness, I sent her one of the above stirrups!
This is a poor picture of a sweetheart stirrup. Sadly it is bent, but still a nice representative.
Here is the modern version of the breakaway. It is hanging upon of my my saddles.
I know this is not truly a sidesaddle stirrup - but it is so unique and I picked it up for a song at my local antique auction.