Oil on Canvas of Lighthouse Seascape signed R Lindstrom purchased 1970s

This is an oil on canvas painting measuring 19 inches x 23.5 inches, including frame, and is signed R Lindstrom. My husband and I purchased it in the 1970s. There is a slight bulge of the canvas in one corner but this is not really obvious when looking at the painting face on. There is 'spotting' on the back of the canvas but none found on the painting itself. The frame is in reasonable condition.

I would welcome any thoughts on its value