i have had this for some years now and has served me well. i am not sure which model it is but i did have 531 frame tube sticker on this. i think it may have been a five gear as the original shifter is on the top tube. i will attach pictures.
I had one with a top tube braze on for the lever a good few years ago that frame wise was absolutely identical apart from the size, model wise there was nothing on mine to identify it unfortunately and components wise I can't say as it came to me as a bare frame but with only one braze on boss I'd assumed it would only have had the rear mech.Midlife":2yaq39bw said:Looks like an old olympic but never seen a braze on gear lever boss on the top tube.... is it held with a self tapper or something ?