Paul de Longpre Watercolor

I don't know much about the painting and did a little research online about the artist Paul de Longpre. I assumed the painting is a watercolor. It is yellow and purple pansies in a vase. It has a gilt frame with a few tiny chips only noticeable when you look closely.It is signed at the right lower bottom of painting. There are two sets of numbers written on the back with pencil A105557 & 1290.There is a little tear on the paper covering the back. The painting is in excellent condition.

I need to know if the painting is authentic and how much its worth.

I appreciate your help.

Jahchad.

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Good