Hand-painted ceramic vase with blue glaze, Winchester

I found a hand-painted ceramic vase yesterday around 4pm on High Street near the Guildhall in Winchester. It's about 9 inches tall, cobalt blue glaze with a delicate gold leaf rim and a tiny sunburst pattern on the base. There's a small chip on the rim and a faint crack along one side that only shows up close. The maker's mark on the bottom looks like a tiny seahorse. If someone recognizes it, please reach out; I'd really like to get it back to its owner, it seems special and I'm hoping to help.