Thank you again for this valuable information, Jim. I have attached the complete portrait as it hangs on our wall- not that his coat offers any clues, I imagine! Because it came from the house of Margaret Bourke, and she lost her eldest son, John, at the age of 19 in 1890, I always wondered if it was him. She lost six children in six years, aged between 19 and one week. I have photographs of the three children who survived to adulthood, and this young man is definitely not one of them. This identification caper really is a matter of gathering as many facts as possible, making an educated guess, and always starting your conversations about the portrait with "This is most likely..." rather than "This is...". Many thanks for your assistance. Jen