I don't have one but I know of one, still on the shelf in a store in Toronto. It's a Velosport and it is a silver/champagne colour and I would estimate it to be closer to a 60 cm. It's $ 600 cdn and I've always thought it would be nice to pick it up if it fit me. I think it has all of the same attributes as yours except this crank may be incorrect.
Warren Young Toronto
>I've been trying for a while to identify my decal-less Japanese 600 ax
>aero frame. Recently I came across this bike for sale on the Web, which
>seems to match mine pretty closely (especially the silver paint):
>
>57cm SR Sakae Ringyo Japanese made early 80's aero shaped Tange Aero
>tubing lugged bike with full Shimano 600 AX "aero" group, including
>Parapull brakes, direct pull rear derailleur, seatpost, and early aero
>brake levers with concealed cable routing. Also has 600 AX freehub wheels
>with semi aero silver Araya rims, bladed spokes, and the hubs have the
>ultimate feature of faired spoke heads,i n order to avoid the dreaded air
>turbulence caused by spoke heads! Also has an aero headset, a headset that
>has no useable flats on it, to avoid the dreaded wrench flat turbulence
>and resuting slowdown. In a silver color that matches the 600AX stuff
>pretty well; absolutely minimal use. The only bike I've ever seen with
>complete AX group; plus this one has an aero section lugged frame, with
>the only round tubes being the head tube and the bottom of the seat tube,
>plus of course the BB shell.
>
>Does anyone out there have a SR aero bike, or pictures or scans they could
>share. I'd like to confirm the identity of mine, and possible scrounge
>some decals for a repaint.
>
>Ron Cooley
>Saskatoon Canada