Some million dollars.
Not much I just bought one on eBay for 99p
This painting is worth $15-$30.
The value of a Robad oil painting will depend on which painting it is. I recommend taking the painting to a local art dealer so they can inspect the painting and see how much it is worth.
how much is it worth
In 1977 my painting was valued at $800.00
How much is a Stephen tedeschi painting worth
How much is a Wijmer 'Snow Capped Peaks' painting worth?
More information is needed because there are huge numbers of Renoir prints. Please post a new, separate question with the name of the original painting and any information about the specific print (date, source, etc.)