BITD steel, lugged production frames were made in size increments. For the American market, less expensive bikes were made in 2" increments, more expensive ones came in 1" increments. When I was younger I was a "tweener", best fit was 24" measured center to center (CTC). My first "real" bike was a Raleigh Super Course, and my choice was 23" or 25". Technically Raleigh made them 23 1/2 or 25 1/2 center to top (CTT). I was 15, so the dealer assumed I'd grow more and got the 25" frame, which I happily rode for years, including a couple of tours down the California coast.

I'd agree with those that say that frame is on the small side for you, but if you enjoy riding it, and the riding position works for you... On your next bike (you do plan on having several vintage bikes, no?) look for one a bit bigger.