Hmmm. I see your point Miles, but what makes you think it's part of a chair? I agree that the stripey bits look a lot like pine but they do also look a lot like cherry. Also furniture made from stained pine tends to be stained after assembly, in which case I would expect to see naked tenons, not stained. There is a third possibility which is that the colour of the photo is not true.
I think you are right about seeing inside though. The only way we will know is to see some end grain. Put the end on your sander Glen, or cut a sliver off with a saw, and see what you get.