Help my identify this bike. Looks like a 3Rensho or early Specialized Allez but can't find any bikes with same features. Any info on brand/years, possibly frame size would be welcome.
Not a complete answer, but you can measure the frame size yourself with a measuring tape.
Its not exact, but you'll see to within a centimetre or so. Road frames normally came in steps of 2cm or half an inch, and sometimes came in 1cm increments for top-end bikes.
Other measurements like top tube length can be measured by starting in the middle of the butting tube.