I would be somewhat surprised if that cerulean blue or ultramarin blue could remain so bright and chromatic after almost 125 years. I would expect more pigment to have dried up or been absorbed into the gesso base.
It’s possible that this began as Van Gogh piece that was completed after he died in 1890 and brother Theo died the year after that. With both gone, there was no one to stop Theo’s widow from finding and hiring someone to complete certain projects.