Antiques: Historic painting well worth restoring

 
Q. This is a somewhat faded painting of Craile Harbour, Scotland. It is oil on canvas 91 by 152 cm (60 x 36 inches) and signed by artist John Blair. This painting had sentimental value to my late mother, who was sent away to Craile Harbour (Crail) during the bombing of Glasgow in WWII. The back of the wood frame has a stamp / sticker saying Dodd & Son, 1842. I’m wondering if the painting has any value, before investing in a restoration. Thank you for your consideration.&nbs