My somewhat vague memory is these were sized like a standard road bike of the time: 58cm C-to-T ST and somewhere in the range of 57-59cm C-to-C TT. I would place it somewhere between the 54.5 and 58cm current Homers.
But don't listen to me, hrab your measuring tape and get some numbers and ride it! That's a rare steed in that color and the price is BIN. No waiting, it's too storming to ride Tuesday anyway, buy a bike!