Hi Harri,
Interesting story. Since the photo is labelled "T. H. Parry-Williams and his motorbike, KC 16, May 1920", and Hampshire bike tells us that the KC series started in March 1920, presumably the photos shows the bike near-new. No reason to doubt that, as the bike looks OK for a 1920-ish 2 3/4 hp Douglas.
I'd be interested to read the essay about the bike. Is it available somewhere?
Thanks for posting.
Leon