Thanks for the replies. I'm not at all hesitant to wear it - the cut, proportions, lapels, stance and vents are all excellent, as is the fit. The tweed is a very subtle grey heather. Just curious as to when it was made.
My jackets and suits, and my memory of those I've worn in my adult life, all have three or four sleeve buttons. The two on each sleeve of this jacket are not widely-spaced, btw, but "kiss".