The painting is unsigned, and had been previously been dismissed by the Van Gogh Museum in the 1990s
The painting is unsigned, and had been previously been dismissed by the Van Gogh Museum in the 1990s. With the development of improved investigative techniques a two-year investigation was launched to determine the painting’s authenticity, eventually determining it as a true Van Gogh in September 2013. It was discovered that the painting was described in a letter to Theo, stating he had painted it the previous day, 4 July 1888.It is the first full-size painting by Van Gogh to be discovered since 1928. -- source link