Antique early 1900 Porcelain Portrait Vase

I have what I believe is called a "portrait vase" in very delicate porcelain. There are no markings on the bottom. I do know the provenance as it was passed down to me by my grandmother and it belonged to her half sister born around 1880. I have the note that she put inside of it telling that it was given to her by her Sunday school class in 1903. I can't find much information on portrait vases unless they are European. Can anyone give me some information, and tell me what the value might be? Thanks so much.

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